ETC DRM029

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3-Phase PM
Synchronous
Motor Control
with Quadrature
Encoder
Using 56F805
Designer Reference
Manual
56800
Hybrid Controller
DRM029/D
Rev. 0, 03/2003
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3-Phase PM Synchronous
Motor Control with
Quadrature Encoder Using
56F805
Designer Reference Manual — Rev 0
by:
Pavel Grasblum, Ph.D.
Motorola Czech System Laboratories
Roznov pod Radhostem, Czech Republic
DRM029 — Rev 0
Designer Reference Manual
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Revision history
To provide the most up-to-date information, the revision of our
documents on the World Wide Web will be the most current. Your printed
copy may be an earlier revision. To verify you have the latest information
available, refer to:
http://www.motorola.com/semiconductors
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The following revision history table summarizes changes contained in
this document. For your convenience, the page number designators
have been linked to the appropriate location.
Revision history
Date
Revision
Level
January,
2003
1
Description
Initial release
Designer Reference Manual
Page
Number(s)
N/A
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Designer Reference Manual — 3-Ph PM SMC with Quadrature Encoder
List of Sections
Section 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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Section 2. Target Motor Theory and Control . . . . . . . . . 21
Section 3. System Description. . . . . . . . . . . . . . . . . . . . . 31
Section 4. Hardware Design. . . . . . . . . . . . . . . . . . . . . . . 35
Section 5. Software Design . . . . . . . . . . . . . . . . . . . . . . . 41
Section 6. System Setup . . . . . . . . . . . . . . . . . . . . . . . . . 53
Appendix A. References. . . . . . . . . . . . . . . . . . . . . . . . . . 65
Appendix B. Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
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List of Sections
Designer Reference Manual
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Designer Reference Manual — 3-Ph PM SMC with Quadrature Encoder
Table of Contents
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Section 1. Introduction
1.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
1.2
Application Benefit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3
Motorola DSP Advantages and Features . . . . . . . . . . . . . . . . . 16
Section 2. Target Motor Theory and Control
2.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
2.2
PM Synchronous Motor Theory . . . . . . . . . . . . . . . . . . . . . . . .21
2.3
Digital Control of a PM Synchronous Motor . . . . . . . . . . . . . . . 23
2.3.1
Control Technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2.3.2
Position Sensing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.3.3
Position Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2.3.4
Speed Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Section 3. System Description
3.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
3.2
System Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.3
Application Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Section 4. Hardware Design
4.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
4.2
System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.3
DSP56F805EVM Controller Board . . . . . . . . . . . . . . . . . . . . . . 36
4.4
EVM Motor Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
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Table of Contents
4.4.1
4.4.2
4.5
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Motor Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Hardware Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Section 5. Software Design
5.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
5.2
Software Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
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5.3
Data Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.3.1
Read Latest Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.3.2
Period Measuring and Velocity Calculation . . . . . . . . . . . . . 44
5.3.3
Speed Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.3.4
3-phase Sinewave generation . . . . . . . . . . . . . . . . . . . . . . . 44
5.4
Software Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.4.1
Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
5.4.2
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.4.3
Drive State Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.5
Implementation Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.5.1
Scaling of Quantities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.5.2
Motor Constant Calculation . . . . . . . . . . . . . . . . . . . . . . . . . 50
Section 6. System Setup
6.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
6.2
Operational Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.3
Application Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
6.4
PM Synchronous Motor versus BLDC Motor . . . . . . . . . . . . . . 58
6.5
DSP56F805EVM Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
6.6
Projects Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
6.7
Application Build & Execute . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Appendix A. References
Designer Reference Manual
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Appendix B. Glossary
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Table of Contents
Designer Reference Manual
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Designer Reference Manual — 3-Ph PM SMC with Quadrature Encoder
List of Figures
Figure
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2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
3-1
4-1
4-2
4-3
5-1
5-2
5-3
6-1
6-2
6-3
6-4
6-5
6-6
6-7
Title
Page
PM Synchronous Motor - Cross Section. . . . . . . . . . . . . . . . . . 21
Torque Optimal Control of PM Synchronous Motor . . . . . . . . . 23
Sinewave Voltage Output Applied
onto a PM Synchronous Motor . . . . . . . . . . . . . . . . . . . . . . . . . 24
3-Phase Power Stage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Stator Flux Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
PM Synchronous Motor Phasor Diagram . . . . . . . . . . . . . . . . . 27
Alignment of Rotor Position . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Speed Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
System Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Low-Voltage Evaluation Motor HW System Configuration . . . . 35
Block Diagram of the DSP56F805EVM . . . . . . . . . . . . . . . . . . 37
EVM Motor Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Main Data Flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
State Diagram - General Overview. . . . . . . . . . . . . . . . . . . . . . 45
Drive State Machine Transitions. . . . . . . . . . . . . . . . . . . . . . . . 48
RUN/STOP Switch and UP/DOWN Buttons
at DSP56F805EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
USER and PWM LEDs at DSP56F805EVM. . . . . . . . . . . . . . . 54
PC Master Software Control Window . . . . . . . . . . . . . . . . . . . . 56
Set-up of the BLDC Motor Control Application
using DSP56F805EVM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
DSP56F805EVM Jumper Reference . . . . . . . . . . . . . . . . . . . . 59
Target Build Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Execute Make Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
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List of Figures
Designer Reference Manual
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Designer Reference Manual — 3-Ph PM SMC with Quadrature Encoder
List of Tables
Table
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1-1
3-1
4-1
4-2
6-1
6-2
Title
Page
Memory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Specifications of the 3-Phase BLDC Motor . . . . . . . . . . . . . . . 32
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Motor Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Motor Application States. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
DSP56F805EVM Jumper Settings . . . . . . . . . . . . . . . . . . . . . . 59
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List of Tables
Designer Reference Manual
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Designer Reference Manual — 3-Ph PM SMC with Quadrature Encoder
Section 1. Introduction
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1.1 Contents
1.2
Application Benefit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3
Motorola DSP Advantages and Features . . . . . . . . . . . . . . . . . 16
1.2 Application Benefit
This Reference Design describes the design of a 3-phase PM
(Permanent Magnet) Synchronous motor drive based on Motorola’s
DSP56F80x dedicated motor control device.
PM Synchronous motors are very popular in a wide range of
applications. Compared with DC motors, PM Synchronous motors are
without a commutator, so they are more reliable than DC motors. Also,
in comparison to AC induction motors, PM Synchronous motors have
advantages. PM Synchronous motors generate the rotor magnetic flux
with rotor magnets so that PM Synchronous motors are highly efficient.
Therefore, PM Synchronous motors are used in high-end white goods
(refrigerators, washing machines, dishwashers, etc.), high-end pumps,
fans and in other appliances, which require high reliability and efficiency.
The concept of this application is a speed-closed loop PM Synchronous
drive using a Quadrature Encoder. It serves as an example of a PM
Synchronous motor control system design using a Motorola
DSP56F805.
This Reference Design includes the basic motor theory, system design
concept, hardware implementation and software design, including the
PC master software visualization tool.
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Introduction
1.3 Motorola DSP Advantages and Features
The Motorola DSP56F80x family is well suited for digital motor control,
combining the DSP’s (Digital Signal Processor) calculation capability
with the MCU’s (Micro Controller Unit) features on a single chip. These
DSPs offer many dedicated peripherals like a Pulse Width Modulation
(PWM) module, an Analog-to-Digital Converter (ADC), Timers,
communication peripherals (SCI, SPI, CAN), on-board Flash and RAM.
Generally, all family members are well-suited for various motor controls.
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A typical member of the family, the DSP56F805, provides the following
peripheral blocks:
•
Two Pulse Width Modulator modules (PWMA & PWMB), each
with six PWM outputs, three Current Sense inputs, and four Fault
inputs, fault tolerant design with deadtime insertion, supporting
both center- and edge-aligned modes
•
12-bit Analog-to-Digital Converters (ADCs), supporting two
simultaneous conversions with dual 4-pin multiplexed inputs; the
ADC can be synchronized to the PWM modules
•
Two Quadrature Decoders (Quad Dec0 & Quad Dec1), each with
four inputs, or two additional Quad Timers A & B
•
Two dedicated General Purpose Quad Timers totaling six pins:
Timer C with two pins and Timer D with four pins
•
A CAN 2.0 A/B Module with a 2-pin port used to transmit and
receive
•
Two Serial Communication Interfaces (SCI0 & SCI1), each with
two pins, or four additional GPIO lines
•
A Serial Peripheral Interface (SPI), with a configurable 4-pin port,
or four additional GPIO lines
•
A Computer Operating Properly (COP) timer
•
Two dedicated external interrupt pins
•
Fourteen dedicated General Purpose I/O (GPIO) pins, 18
multiplexed GPIO pins
•
An external reset pin for hardware reset
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Introduction
Motorola DSP Advantages and Features
•
JTAG/On-Chip Emulation (OnCE)
•
a software-programmable, Phase Lock Loop-based frequency
synthesizer for the DSP core clock
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Table 1-1. Memory Configuration
DSP56F801
DSP56F803
DSP56F805
DSP56F807
Program Flash
8188 x 16-bit
32252 x 16-bit
32252 x 16-bit
61436 x 16-bit
Data Flash
2K x 16-bit
4K x 16-bit
4K x 16-bit
8K x 16-bit
Program RAM
1K x 16-bit
512 x 16-bit
512 x 16-bit
2K x 16-bit
Data RAM
1K x 16-bit
2K x 16-bit
2K x 16-bit
4K x 16-bit
Boot Flash
2K x 16-bit
2K x 16-bit
2K x16-bit
2K x 16-bit
Aside from to the fast Analog-to-Digital converter and the 16-bit Quad
Timers, the most interesting peripheral from the PM Synchronous motor
control point of view is the Pulse Width Modulation (PWM) module. The
PWM module offers a high degree of freedom in its configuration,
permitting efficient control of the PM Synchronous motor.
The PWM has the following features:
•
Three complementary PWM signal pairs, or six independent PWM
signals
•
Features of complementary channel operation
•
Deadtime insertion
•
Separate top and bottom pulse width correction via current status
inputs or software
•
Separate top and bottom polarity control
•
Edge-aligned or center-aligned PWM signals
•
15 bits of resolution
•
Half-cycle reload capability
•
Integral reload rates from 1 to 16
•
Individual software-controlled PWM outputs
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Introduction
•
Mask and Swap of PWM outputs
•
Programmable fault protection
•
Polarity control
•
20mA current sink capability on the PWM pins
•
Write-protectable registers
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The PM Synchronous motor control utilizes the PWM block set in the
complementary PWM mode, permitting generation of control signals for
all switches of the power stage with inserted deadtime. The PWM block
generates three sinewave outputs mutually shifted by 120 degrees.
The Quad Timer is an extremely flexible module, providing all required
services related to time events. It has the following features:
•
Each timer module consists of four 16-bit counters/timers
•
Count up/down
•
Counters are cascadable
•
Programmable count modulo
•
Max count rate equals peripheral clock/2 when counting external
events
•
Max count rate equals peripheral clock when using internal clocks
•
Count once or repeatedly
•
Counters are preloadable
•
Counters can share available input pins
•
Each counter has a separate prescaler
•
Each counter has capture and compare capability
The PM Synchronous motor application utilizes one channel of the Quad
Timer module counting in quadrature mode. It enables sensing of the
rotor position using the Quadrature Encoder. The second channel of the
Quad Timer module is set to generate a time base for a speed controller.
The Quadrature Decoder is a module providing decoding of position
signals from a Quadrature Encoder mounted on a motor shaft. It has the
following features:
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Introduction
Motorola DSP Advantages and Features
•
Logic to decode quadrature signals
•
Configurable digital filter for inputs
•
32-bit position counter
•
16-bit position difference counter
•
Maximum count frequency equals the peripheral clock rate
•
Position counter can be initialized by software or external events
•
Preloadable 16-bit revolution counter
•
Inputs can be connected to a general purpose timer to aid low
speed velocity.
The PM Synchronous motor application utilizes the Quadrature Decoder
connected to Quad Timer module A. It uses the Decoder’s digital input
filter, to filter the Encoder’s signals, but does not make use of its
decoding functions, so the decoder’s digital processing capabilities are
free to be used by another application.
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Introduction
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Designer Reference Manual — 3-Ph PM SMC with Quadrature Encoder
Section 2. Target Motor Theory and Control
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2.1 Contents
2.2
PM Synchronous Motor Theory . . . . . . . . . . . . . . . . . . . . . . . .21
2.3
Digital Control of a PM Synchronous Motor . . . . . . . . . . . . . . . 23
2.2 PM Synchronous Motor Theory
The PM Synchronous motor is a rotating electric machine where the
stator is a classic three phase stator like that of an induction motor and
the rotor has surface-mounted permanent magnets (see Figure 2-1).
Stator
Stator winding
(in slots)
Shaft
Rotor
Air gap
Permanent magnets
Figure 2-1. PM Synchronous Motor - Cross Section
In this respect, the PM Synchronous motor is equivalent to an induction
motor where the air gap magnetic field is produced by a permanent
magnet. It means that the rotor magnetic field is constant. PM
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Target Motor Theory and Control
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Target Motor Theory and Control
Synchronous motors provide a set of advantages for designing modern
motion control systems. The use of a permanent magnet to generate a
substantial air gap magnetic flux makes it possible to design highly
efficient PM motors.
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The PM Synchronous motor is described by the following equations:
dψ S
u S = r S ⋅ i S + ---------dt
(EQ 2-1.)
ψS = LS ⋅ iS + ψM
(EQ 2-2.)
T e = i S ⋅ ψ S ⋅ sin ( ∠i S, ∠ψ S ) = i S ⋅ ψ M ⋅ sin ( ∠i S, ∠ψ M )
(EQ 2-3.)
where
uS
is the space phasor of stator voltage
iS
is the space phasor of stator current
rS
is the stator phase resistance
ΨS
is the space phasor of stator magnetic flux
ΨM
is the space phasor of rotor magnetic flux evoked by the
permanent magnet
Te
is the electrical torque
As can be seen from equation (EQ 2-3), optimal torque is generated
when the stator current vector is placed ± 90° relative to the rotor
permanent magnet flux space vector. This situation is shown in
Figure 2-2.
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Target Motor Theory and Control
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Target Motor Theory and Control
Digital Control of a PM Synchronous Motor
jωL s i s
R si s
us
e
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ψs
is
90°
ψ
ψM
Figure 2-2. Torque Optimal Control of PM Synchronous Motor
where
RS
is the stator resistance
LS
is the stator inductance
e
is the Back-EMF voltage
Ψ
resultant magnetic flux
2.3 Digital Control of a PM Synchronous Motor
A PM Synchronous motor is driven by sinewave voltage coupled with the
given rotor position. The generated stator flux together with the rotor flux,
which is generated by a rotor magnet, defines the torque, and thus
speed, of the motor. The sinevawe voltage output have to be applied to
the 3-phase winding system in a way that angle between the stator flux
and the rotor flux is kept close to 90° to get the maximum generated
torque. To meet this criterion, the motor requires electronic control for
proper operation.
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Target Motor Theory and Control
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Target Motor Theory and Control
Output
Voltage
Phase A
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0
60
Phase B
120
180
Phase C
240
300
360 Electrical
Angle
Figure 2-3. Sinewave Voltage Output Applied
onto a PM Synchronous Motor
For a common 3-phase PM Synchronous motor, a standard 3-phase
power stage is used. The same power stage is used for AC induction and
BLDC motors. Such a power stage for 3-phase PM Synchronous motors
is illustrated in Figure 2-4. The power stage utilizes six power transistors
with independent switching. The power transistors are switched in the
complementary mode. The sinewave output is generated using a PWM
technique.
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Target Motor Theory and Control
Digital Control of a PM Synchronous Motor
U DCB
PWM_Q3
PWM_Q1
Q5
Q3
Q1
PWM_Q5
C1
Q2
Freescale Semiconductor, Inc...
PWM_Q2
Q4
Q6
PWM_Q6
PWM_Q4
GND
Phase_A
Phase_B
Phase_C
Figure 2-4. 3-Phase Power Stage
2.3.1 Control Technique
The presented control algorithm demonstrates the principle of PM
Synchronous motor control and use of the DSP56F80x peripherals. It
means that this algorithm can be used as starting point for more
sophisticated algorithms.
As is well known, the PM Synchronous (Permanent Magnet) motor is
very similar to a Brushless DC motor. The PM Synchronous motors differ
in three respects:
•
sinusoidal distribution of magnet flux in the air gap
•
sinusoidal current waveforms
•
sinusoidal distribution of stator conductors.
Using a six-step control technique we get six flux vectors. This technique
is commonly used for BLDC motors (see 10, 11). In the case of
sinusoidal voltage output, we are able to generate the stator flux in any
position. The resultant flux is calculated as the sum of flux vectors of
Phase A, Phase B and Phase C (see Figure 2-5). If the phase voltage
changes sinusoidally over time, a fluent rotational flux field is generated.
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As a result, a PM Synchronous motor runs smoother and quiter than a
BLDC motor.
Figure 2-5. Stator Flux Generation
The motor runs with optimal torque generation when the angle between
the stator and rotor flux is 90 electric degrees (see Figure 2-6 a).
To ensure the angle between rotor and stator flux equals to 90 electric
degrees it is necessary to know the position of the rotor and stator flux.
The position of the rotor flux is bound to the rotor position. Thus,
by measuring rotor position we can get the exact position of the rotor
flux.
The position of stator flux is bound to the vector of the stator current. To
know the exact position of the stator flux, it requires measurement of the
phase currents and the calculation of the stator current vector. Since the
presented application does not measure current, there is no way to
obtain the position of current vector.
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Target Motor Theory and Control
Digital Control of a PM Synchronous Motor
To avoid the current measurement there is one of possible solution
which aligns the vector of the applied voltage to be orthogonal to the
rotor position (see Figure 2-6 b). As can be seen, the angle between the
stator and rotor flux is not exactly 90 electric degrees because the
voltage drop on the stator inductance is not compensated. The real
angle is lower than 90 electric degrees and depends on the load.
Freescale Semiconductor, Inc...
For low-cost applications, such a solution is fully sufficient. For high-end
applications, the current measurement and the stator flux need to be
evaluated. (see 12)
jωL s i s
jωL s i s
Rsis
us
R s .i s
us
e
e
ψ
ψs
is
ψs
ψM
ψ
ψM
is
a)
b)
Figure 2-6. PM Synchronous Motor Phasor Diagram
2.3.2 Position Sensing
The rotor position is obtained from a Quadrature Encoder mounted on
the rotor shaft. The encoder transfers the rotational movement into
signal pulses corresponding to the position. The Quadrature Encoder
output signals are connected to the on-chip Quadrature Decoder input.
The signals go through a digital filter to the Quad Timer. The Quad Timer
is set to count in quadrature mode. During alignment, the Quad Timer is
preset to a value which represents a shift of the rotor position by 90
electrical degrees. Thus, the applied voltage is aligned with Back-EMF
according to Figure 2-6 b.
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2.3.3 Position Alignment
Freescale Semiconductor, Inc...
Since the Quadrature Encoder doesn’t give the absolute position, we
need to know exactly the rotor position before the motor is started. One
possible, and very easy implementable, method is the rotor alignment to
a predefined position. The motor is powered by a selected static voltage
pattern (usually the zero position in the sinewave table) and the rotor
aligns to the predefined position. The alignment is done only once during
first motor start. Figure 2-7 shows the position of the aligned rotor. After
alignment the position counter is set to 90 electric degrees from
alignment position in order to preset the angle between stator and rotor
flux.
Figure 2-7. Alignment of Rotor Position
2.3.4 Speed Control
The correct shift between the rotor and stator flux ensures that the PM
Synchronous motor generates a torque. The torque amplitude depends
on the amplitude of the applied voltage. It means that the motor speed
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Digital Control of a PM Synchronous Motor
Freescale Semiconductor, Inc...
is also controlled by the amplitude of the applied voltage. The amplitude
of the applied voltage is changed by the PWM technique. The required
speed is controlled by a speed controller. The speed controller is
implemented as a conventional PI controller. The PI controller compares
the actual and required speeds. The difference between the actual and
required speed is input to the PI controller and based on this difference.
The PI controller calculates the duty cycle which corresponds to the
voltage amplitude required to keep the required speed.
Power Stage
Σ
-
ωerror
Speed
Controller
Sinewave
Amplitude
PWM
Generator
ωactual
Sinewave
Generation
Rotor Position
Figure 2-8. Speed Controller
The speed controller calculates a Proportional-Integral (PI) algorithm
according to the equations below:
1 τ
u ( t ) = K c e ( t ) + ----- ∫ e ( τ ) dτ
TI 0
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(EQ 2-4.)
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After transformation to a discrete time domain using an integral
approximation by a Backward Euler method, we get the following
equations for the numerical PI controller calculation:
e( k)= w( k) – m( k)
(EQ 2-5.)
u ( k ) = uP ( k ) + uI ( k )
(EQ 2-6.)
uP ( k ) = Kc ⋅ e ( k )
(EQ 2-7.)
T
u I ( k ) = u I ( k – 1 ) + K c ----- ⋅ e ( k )
TI
(EQ 2-8.)
where:
e(t), e(τ)
is the input error in time t, τ
e(k)
is the input error in step k
w(k)
is the desired value in step k
m(k)
is the measured value in step k
u(k)
is the controller output in step k
up(k)
is the proportional output portion in step k
uI(k)
is the integral output portion in step k
uI(k-1)
is the integral output portion in step k-1
TI
is the integral time constant
T
is the sampling time
Kc
is the controller gain
t, τ
is the time
p
is the Laplace variable
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Designer Reference Manual — 3-Ph PM SMC with Quadrature Encoder
Section 3. System Description
Freescale Semiconductor, Inc...
3.1 Contents
3.2
System Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.3
Application Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
3.2 System Outline
The system is designed to drive a 3-phase PM Synchronous motor. The
application meets the following performance specification:
•
Voltage control of PM Synchronous motor using Quadrature
Encoder
•
Targeted for DSP56F805EVM
•
Running on a 3-phase EVM Motor Board
•
Control technique incorporates:
– Voltage PM Synchronous motor control with speed-closed
loop
– Both directions of rotation
– Motoring mode
– Start from any motor position without rotor alignment
– Minimum speed 50 RPM
– Maximum speed 1000 RPM (limited by power supply)
•
Manual interface (Start/Stop switch, Up/Down push button control,
Led indication)
•
PC master software control interface (motor start/stop, speed
set-up)
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System Description
•
PC master software monitor
– PC master software graphical Control Page (required speed,
actual motor speed, start/stop status, DC-Bus voltage level,
system status)
– PC master software Speed Scope (observes actual & desired
speeds)
•
DC-Bus under-voltage fault protection
Freescale Semiconductor, Inc...
The introduced PM Synchronous drive is designed to power a
low-voltage PM Synchronous motor equipped with a Quadrature
Encoder, which is supplied with the EVM Motor Board. The motor has
the following specifications:
Table 3-1. Specifications of the 3-Phase BLDC Motor
Motor Specification:
Position Sensor
Specification:
NOTE:
eMotor Type:
3-Phase BLDC Motor
4 Poles
Speed Range:
< 5000 RPM
Line Voltage:
60V
Phase Current:
2A
Sensor 1 Type:
3-Phase Hall Sensors
Sensor 2 Type:
Quadrature Encoder
500 Pulses Per Revolution
The application SW is targeted for PM Synchronous motor with
sine-wave Back-EMF shape. In this particular demo application the
BLDC motor is used instead. This is due to the availability of the BLDC
motor supplied as ECMTREVAL. Although the Back-EMF shape of this
motor is not ideally sine-wave, it can be controlled by the application SW.
The drive parameters will be even better when PMSM motor with exactly
sine-wave Back-EMF shape is used.
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System Description
Application Description
3.3 Application Description
•
Power Supply 12V DC, 4Amps
•
EVM Motor Board
•
BLDC Motor IB23810 with Quadrature Encoder
•
Evaluation Board DSP56F805
The DSP runs the main control algorithm. According to the user interface
and feedback signals it generates 3-phase PWM output signals for the
AC/BLDC inverter.
DSP56F80xEVM
12V DC
DSP56F80x
PWM1-6
PC Master
Control SW
R
S
2
3
2
SINWAVE
Generation
Amplitude
START
STOP
UP
DOWN
G
P
I
O
Required
Speed
P
W
M
EVM
Motor Board
Speed
Calculation
PI
Controller
Rotor Position
Freescale Semiconductor, Inc...
A standard system concept is chosen for the drive (see Figure 3-1). The
system incorporates the following hardware boards:
T
I
M
E
R
D
E
C
O
D
E
R
Quadrature Encoder
Signals
BLDC
Motor
Figure 3-1. System Concept
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System Description
The control process is as follows:
Freescale Semiconductor, Inc...
The state of the user interface is periodically scanned while the speed of
the motor is measured on each new coming edge from the Quadrature
Encoder (only one phase is used for speed measurement). According to
the state of the control signals (Start/Stop switch, speed up/down
buttons) the speed command is calculated. The comparison between
the actual speed command and the measured speed generates a speed
error. The speed error is brought to the speed PI controller that
generates a new corrected amplitude of the sinewave output. The rotor
position is also periodically scanned together with sinewave generation.
The sinewave generation generates 3-phase sinewaves, shifted by 120
electrical degrees according to actual rotor position and the required
amplitude. The output of sinewave generation defines directly the duty
cycle of the PWM output signals for the power stage.
In the case of under-voltage, the PWM outputs are disabled and the fault
state is displayed by an on-board LED.
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Designer Reference Manual — 3-Ph PM SMC with Quadrature Encoder
Section 4. Hardware Design
Freescale Semiconductor, Inc...
4.1 Contents
4.2
System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.3
DSP56F805EVM Controller Board . . . . . . . . . . . . . . . . . . . . . . 36
4.4
EVM Motor Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
4.5
Hardware Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.2 System Configuration
The application is designed to drive the 3-phase PM Synchronous
motor. It consists of the following modules (see Figure 4-1):
•
DSP56F805EVM Controller Board
•
Evaluation Motor Board
•
3-phase BLDC Motor
40w Flat
Ribbon
Cable
U2
+12
J3
GND
12VDC
Evaluation
Motor
Board
U1
Controller Board
J30
J1
J2
M1
IB23810
DSP5680xEVM
J23
Motor
ECMTREVAL
Encoder Cable
Figure 4-1. Low-Voltage Evaluation Motor HW System
Configuration
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NOTE:
The application SW is targeted for PM Synchronous motor with
sine-wave Back-EMF shape. In this particular demo application the
BLDC motor is used instead. This is due to the availability of the BLDC
motor supplied as ECMTREVAL. Although the Back-EMF shape of this
motor is not ideally sine-wave, it can be controlled by the application SW.
The drive parameters will be even better when PMSM motor with exactly
sine-wave Back-EMF shape is used.
4.3 DSP56F805EVM Controller Board
The DSP56F805EVM is used to demonstrate the abilities of the
DSP56F805 and to provide a hardware tool allowing the development of
applications that use the DSP56F805.
The DSP56F805EVM is an evaluation module board that includes a
DSP56F805 part, peripheral expansion connectors, external memory
and a CAN interface. The expansion connectors are for signal
monitoring and user feature expandability.
The DSP56F805EVM is designed for the following purposes:
•
Allowing new users to become familiar with the features of the
56800 architecture. The tools and examples provided with the
DSP56F805EVM facilitate evaluation of the feature set and the
benefits of the family.
•
Serving as a platform for real-time software development. The tool
suite enables the user to develop and simulate routines, download
the software to on-chip or on-board RAM, run it, and debug it using
a debugger via the JTAG/OnCETM port. The breakpoint features of
the OnCE port enable the user to easily specify complex break
conditions and to execute user-developed software at full-speed,
until the break conditions are satisfied. The ability to examine and
modify all user accessible registers, memory and peripherals
through the OnCE port greatly facilitates the task of the developer.
•
Serving as a platform for hardware development. The hardware
platform enables the user to connect external hardware
peripherals. The on-board peripherals can be disabled, providing
the user with the ability to reassign any and all of the DSP's
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Hardware Design
DSP56F805EVM Controller Board
peripherals. The OnCE port's unobtrusive design means that all
of the memory on the board and on the DSP chip are available to
the user.
Freescale Semiconductor, Inc...
The DSP56F805EVM provides the features necessary for a user to write
and debug software, demonstrate the functionality of that software and
interface with the customer's application-specific device(s). The
DSP56F805EVM is flexible enough to allow a user to fully exploit the
DSP56F805's features to optimize the performance of their product, as
shown in Figure 4-2.
DSP56F805
RESET
LOGIC
RESET
MODE/IRQ
LOGIC
MODE/IRQ
Program Memory
64Kx16-bit
Address,
Data &
Control
SPI
SCI #0
RS-232
Interface
DSub
9-Pin
CAN Interface
SCI #1
CAN
Data Memory
64Kx16-bit
4-Channel
10-bit D/A
Debug LEDs
Peripheral
Expansion
Connector(s)
PWM LEDs
TIMER
Over V Sense
GPIO
Over I Sense
Memory
Expansion
Connector(s)
JTAG
Connector
DSub
25-Pin
Zero Crossing
Detect
JTAG/OnCE
A/D
Parallel
JTAG
Interface
Low Freq
Crystal
PWM #1
PWM #2
XTAL/EXTAL
3.3 V & GND
Primary
UNI-3
Secondary
UNI-3
Power Supply
3.3V, 5.0V & 3.3VA
Figure 4-2. Block Diagram of the DSP56F805EVM
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4.4 EVM Motor Board
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Motorola’s evaluation motor board (EVM motor board) is a 12-volt,
4-amp power stage that is an integral part of Motorola’s embedded
motion control series of development tools. It is supplied in kit number
ECMTREVAL, along with a small brushless dc motor, an encoder, an
encoder cable, a 40-pin ribbon cable, and mounting hardware. In
combination with one of the embedded motion control series control or
evaluation boards, it provides a ready-made software development
platform for small brushless dc motors. The motor is capable of being
controlled with either Hall sensors, an optical encoder, or with
sensorless techniques. Figure 4-3 is an illustration of the board.
Motor
Connector
UNI-3
Connector
Power Supply
Connector
Figure 4-3. EVM Motor Board
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Hardware Design
EVM Motor Board
4.4.1 Electrical Characteristics
The electrical characteristics in Table 4-1 apply to operation at 25°C and
a 12-Vdc power supply voltage.
Table 4-1. Electrical Characteristics
Freescale Semiconductor, Inc...
Characteristic
Symbol
Min
Typ
Max
Units
Power Supply Voltage
Vdc
10
12
16
V
Quiescent Current
ICC
—
50
—
mA
Min Logic 1 Input Voltage
VIH
2.4
—
—
V
Max Logic 0 Input Voltage
VIL
—
—
0.8
V
Input Resistance
RIn
—
10
—
kΩ
Analog Output Range
VOut
0
—
3.3
V
Bus Current Sense Voltage
ISense
—
412
—
mV/A
Bus Voltage Sense Voltage
VBus
—
206
—
mV/V
RDS(On)
—
32
40
MΩ
IM
—
—
6
A
Pdiss
—
—
5
W
Power MOSFET On Resistance
RMS Output Current
Total Power Dissipation
4.4.2 Motor Characteristics
The motor characteristics in Table 4-2 apply to operation at 25°C.
Table 4-2. Motor Characteristics
Characteristic
Terminal Voltage
Symbol
Min
Typ
Max
Units
Vt
—
—
60
V
—
5000
—
RPM
Speed @ Vt
Torque Constant
Kt
—
0.08
—
Nm/A
Voltage Constant
Ke
—
8.4
—
V/kRPM
Winding Resistance
Rt
—
2.8
—
Ω
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Table 4-2. Motor Characteristics
Winding Inductance
L
—
8.6
—
mH
Continuous Current
Ics
—
—
2
A
Peak Current
Ips
—
—
5.9
A
Inertia
Jm
—
0.075
—
kgcm2
—
—
3.6
°C/W
Freescale Semiconductor, Inc...
Thermal Resistance
4.5 Hardware Documentation
.All the system parts are supplied and documented according the
following references:
•
M1 - IB23810 Motor
– supplied in kit ECMTREVAL - Evaluation Motor Board Kit
•
U2 EVM Motor Board:
– supplied in kit with IB23810 Motor: ECMTREVAL - Evaluation
Motor Board Kit
– described in: Evaluation Motor Board User’s Manual
•
U1 CONTROLLER BOARD for DSP56F805:
– supplied as: DSP56805EVM
– described in: DSP Evaluation Module Hardware User’s Manual
Detailed descriptions of individual boards can be found in
comprehensive User’s Manuals belonging to each board. The manuals
are available on the Motorola web. The User’s Manual incorporates the
schematic of the board, description of individual function blocks and a bill
of materials. An individual board can be ordered from Motorola as a
standard product.
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Designer Reference Manual — 3-Ph PM SMC with Quadrature Encoder
Section 5. Software Design
Freescale Semiconductor, Inc...
5.1 Contents
5.2
Software Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.3
Data Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.4
Software Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.5
Implementation Notes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.2 Software Description
This section describes the design of the software blocks for the drive.
The software will be described in terms of:
•
Control Algorithm Data Flow
•
Software Implementation
5.3 Data Flow
The control algorithm of a close loop PM Synchronous drive is described
in Figure 5-1. The individual processes are described in the following
sections.
The main data flow can be divided to four parts:
•
Speed control
•
Velocity calculation
•
3-phase sinewave generation
•
DC-Bus voltage measurement
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Speed control starts with the required speed omega_required_mech.
This variable is set by user buttons or remotely by the PC within allowed
limits. The variable omega_required_mech is copied to
omega_desired_mech at a defined moment. This variable is used as
a shadow variable to avoid change of the required speed from the PC at
any time. The variable omega_desired_mech is input to the speed PI
controller as a reference value.
Freescale Semiconductor, Inc...
MeasuredTime incorporates a time period of one phase of the
Quadrature Encoder. The time period is used for speed calculation.
Calculated speed, omega_actual_mech, is input to the speed PI
controller as a secondary input. The PI controller output determines the
amplitude of the generated sinusoidal output signals.
For the rotor position scanning the Timer A0, set as a quadrature
counter, is used. The Timer A0 gives the actual rotor position shifted by
90 electrical degrees after initialization. This rotor position
RotorPosition is input to the 3-phase sinewave modulation together
with required amplitude Amplitude. The result of the sinewave
modulation is written directly to the PWM block. The rotor position
scanning with sinewave modulation is performed by an interrupt routine,
which is called each PWM reload (16 kHz). The next task, which is
provided by an interrupt routine, is the calculation of the spin direction.
The result, DirectionSpinning, is used for the speed calculation.
The variable u_dc_bus contains the actual DC-Bus voltage. The value
is used for an under-voltage detection.
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Software Design
Data Flow
.
SCI
Communication
Process
SCI
POSITION SENSOR
(Quadrature Decoder)
Freescale Semiconductor, Inc...
SPEED
SETTING
by BUTTONS
omega_required_mech
Read Latest
Position
Period
Measuring
omega_desired_mech
MeasuredTime
DirectionSpinning RotorPosition
Velocity
Calculation
Speed Controller
(PI Controller)
omega_actual_mech
Amplitude
3-Phase Sinewave
Generation
DC-Bus Voltage
(A/D Converter)
Software Block
u_dc_bus
Hardware Block
PWM GENERATION
Figure 5-1. Main Data Flow
5.3.1 Read Latest Position
The process Read Latest Position is executed with each PWM Reload
interrupt (16 kHz). The process reads the actual rotor position and
calculates the direction of spinning.
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5.3.2 Period Measuring and Velocity Calculation
The processes, Period Measuring and Velocity Calculation, read the
time between the adjacent edges of one phase of the Quadrature
Encoder and calculates the actual motor speed omega_actual_mech.
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5.3.3 Speed Controller
This process compares the required and actual speed and calculates the
duty cycle of the PWM output signals. For detailed information see
Section 2.3.4, Speed Control
5.3.4 3-phase Sinewave generation
The process 3-phase Sinewave Generation calculates the PWM output
from the actual rotor position and the required sinewave amplitude. The
output is written to the PWM module. This process is performed within
the PWM Reload interrupt.
5.4 Software Implementation
The general software diagram shows the Main routine entered from
Reset and the interrupt states (see Figure 5-2).
The Main routine initializes both the DSP and the application, then
enters into an infinite background loop. This loop contains an application
State Machine.
The following interrupt service routines are utilized:
•
PWM Reload ISR- services signals generated by the Quadrature
Encoder and generates the 3-phase sinewave output
•
Input Capture ISR (TimerA1) - services period measurement for
speed calculation
•
Timer ISR - services the speed controller and LED diode blinking
•
Push Button Up ISR and Push Button Down ISR - service the Up
and Down push buttons
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•
SCI ISR - services communication with the PC master software
Reset
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Initialization
Interrupts
Main loop
(State Machine)
Figure 5-2. State Diagram - General Overview
5.4.1 Initialization
The Main Routine provides initialization of the DSP:
•
Disables Interrupts
•
Initializes DSP PLL
•
Disables COP and LVI
•
Initializes the Timer for time base reference 1 ms
•
Initializes the LED
•
Initializes the PWM module:
– Center-aligned complementary PWM mode, positive polarity
– PWM modulus - defines PWM frequency
– PWM deadtime - defines PWM deadtime
– Disable faults
•
Initializes Quadrature Decoder
– Sets on-chip digital filter of the Quadrature Decoder inputs
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– Connects Quadrature Decoder signals to QuadTimerA
•
Initializes QuadTimerA - channel A0
– set Count Mode to Quadrature Count
– set Input Source to Input 0
– set Input Polarity to Normal
– set Secondary Input Source to Input 1
Freescale Semiconductor, Inc...
– set Count Frequency to Repeatedly
– set Count Length to Until Compare
– set Count Direction to Down
– disable Capture Mode
•
Initializes QuadTimerA - channel A1
– set Count Mode to Count
– set Input Source to Bus Clock / 128
– set Input Polarity to Normal
– set Secondary Input Source to Input 1
– set Count Frequency to Repeatedly
– set Count Length to Past Compare
– set Count Direction to Up
– set Capture Mode = RisingEdges
– associate Callback On Input Edge to CallbackOnNewEdge
– associate CallbackOnOverflow to CallbackOnOverload
•
Sets-up I/O ports (brake, switch, push buttons)
– Brake, LED, switch on GPIO
– Push buttons on interrupts IRQ0, IRQ1
•
Initializes the Analog-to-Digital Converter
– ADC set for sequential sampling, single conversion
– Channel 0 = DC-Bus voltage
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•
Initializes control algorithm (speed controller, control algorithm
parameters)
•
Enables interrupts
•
Starts ADC conversion
5.4.2 Interrupts
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The interrupt handlers have the following functions:
•
PWM Reload reads the actual rotor position, calculates the
3-phase sinewave output and spin direction and updates PWM
Value Registers.
•
Input Capture Interrupt Handler (Timer A1) reads the time
between the two subsequent IC edges one phase of the
Quadrature Encoder, which is used for speed calculation.
•
Timer Interrupt Handler generates the time base 1ms. The routine,
called within this time base, blinks the green LED diode, reads the
result of the ADC conversion, calculates the speed and provides
the speed controller.
•
Push Button Interrupt Handler takes care of the push button
service. The UpButton Interrupt Handler increments the desired
speed, the DownButton Interrupt Handler decrements the desired
speed.
•
PC and SCI Interrupt Handlers provide SCI communication and
service routines for the PC master software. These routines are
fully independent of the motor control tasks.
5.4.3 Drive State Machine
The drive can be in any of the states shown in Figure 5-3, which shows
the transition conditions between the drive states. The user is able to
recognize the current state, by a blinking green LED diode. In the case
of the init and stop state, the green LED diode blinks at a frequency of
2 Hz. In the fault state, the green LED diode blinks at a frequency of
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8 Hz. During the running state, the green LED diode is continuously
turned on.
SwitchState=RUN
Reset
u_dc_bus>=MIN_DC_BUS_VOLTAGE
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Init
State
Fault
State
SwitchState=STOP
u_dc_bus<MIN_DC_BUS_VOLTAGE
Stopped
State
SwitchState=STOP
SwitchState=RUN
Running
State
Figure 5-3. Drive State Machine Transitions
5.5 Implementation Notes
The following chapter describes calculation of application constans and
quantity scaling.
5.5.1 Scaling of Quantities
The PM Synchronous motor control application uses a fractional
representation for all real quantities except time. The N-bit signed
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Implementation Notes
fractional format is represented using 1.[N-1] format (1 sign bit, N-1
fractional bits). Signed fractional numbers (SF) lie in the following range:
– 1.0 ≤ SF ≤ +1.0 -2
–[ N – 1 ]
(EQ 5-1.)
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For words and long-word signed fractions, the most negative number
that can be represented is -1.0, whose internal representation is $8000
and $80000000, respectively. The most positive word is $7FFF or 1.0 2-15, and the most positive long-word is $7FFFFFFF or 1.0 - 2-31.
The following equation shows the relationship between real and
fractional representations:
Real Value
Fractional Value = -------------------------------------------------Real Quantity Range
(EQ 5-2.)
where:
Fractional Value is a fractional representation of the real value [Frac16]
Real Value is the real value of the quantity [V, A, RPM, etc.]
Real Quantity Range is the maximum range of the quantity, defined in the
application [V, A, RPM, etc.]
5.5.1.1 DC-Bus Voltage Scaling
The DC-Bus voltage sense is defined by the following equation:
V DC_BUS
u_dc_bus = ----------------------------- ⋅ 32767
V MAX
Where:
u_dc_bus = variable of DC-Bus voltage
VDC_BUS = measured DC-Bus voltage
VMAX = max. measurable DC-Bus voltage.
NOTE:
VMAX = 16V for the EVM Motor Board
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5.5.1.2 PI Controller Parameters
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The P constant was chosen as 0.2 (26214 * 2-17) and the I constant was
chosen as 0.3 (31457 * 2-20) or 0.12 (31457 * 2-18). To get better
response to error speed, the I constant is changed according the actual
speed. The I constant equals 0.3 from 50 to 200 RPM. Over 200 RPM
the I constant equals 0.12. The controller parameters were
experimentally tuned.
5.5.1.3 Velocity Calculation
The constant OMEGA_ACTUAL_MECH_CONST is defined by the following
equations:
position difference = 1/500 rev (given by each rising edge of one
phase of Quadrature Encoder and two pole pairs motor)
max. period time = 0.008 s (chosen according to required min.
speed)
vmin = 60*(position difference)/(max. period time) = 15 RPM
vmax = 100*vmin = 1500 RPM (chosen according to required max.
speed)
OMEGA_ACTUAL_MECH_CONST = 32767*vmin/vmax = 327
5.5.2 Motor Constant Calculation
The PM Synchronous motor control application uses the constants,
which depend on a motor type (number of pole pairs) and on a
Quadrature Encoder type (number of pulses per revolution). The
depended constants are:
•
PULSES_PER_REVOLUTION
•
VOLTAGE_SHIFT
•
SIN_TABLE_MULTIPLIER
The following paragraphs explain the constant calculations. The range
for all constants is unsigned integer.
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Implementation Notes
5.5.2.1 Constant PULSES_PER_REVOLUTION
The constant PULSES_PER_REVOLUTION defines the number of pulses
of the Quadrature Encoder per electrical revolution. Since the
Quadrature Encoder counts both rising and falling edges, the value is
multiplied by four. The resultant value must be an integer.
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4 × number of pulses per mech. revolution
PULSES_PER_REVOLUTION = ------------------------------------------------------------------------------------------------------ – 1
number of pole pairs
(EQ 5-3.)
In the case of presented application the constant is equal:
4 × 500
PULSES_PER_REVOLUTION = ------------------ – 1 = 999
2
NOTE:
In case that the constant is not an integer, it is necessary to set the
constant PULSES_PER_REVOLUTION to a value which is equal to the
number of pulses per mechanical revolution minus one. Then the actual
rotor position has to be recalculated from the mechanical to electrical
revolution.
5.5.2.2 Constant VOLTAGE_SHIFT
The constant VOLTAGE_SHIFT defines the shift of applied voltage by 90
el. degree and is calculated as:
( PULSES_PER_REVOLUTION + 1 )
VOLTAGE_SHIFT = ----------------------------------------------------------------------------------------4
(EQ 5-4.)
Then for the presented application the constant is equal to:
( 999 + 1 )
VOLTAGE_SHIFT = ----------------------- = 250
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5.5.2.3 Constant SIN_TABLE_MULTIPLIER
The constant SIN_TABLE_MULTIPLIER rescales the rotor position,
which is defined in pulses per electrical revolution, to the sinewave table,
which is scaled from -1 to 1 <-π; π).The constant is calculated as:
Freescale Semiconductor, Inc...
65535
SIN_TABLE_MUTIPLIER = --------------------------------------------------------------------------- × 256
PULSES_PER_REVOLUTION
(EQ 5-5.)
For the presented calculation can be calculated:
65535
SIN_TABLE_MUTIPLIER = --------------- × 256 = 16794
999
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Designer Reference Manual — 3-Ph PM SMC with Quadrature Encoder
Section 6. System Setup
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6.1 Contents
6.2
Operational Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.3
Application Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
6.4
PM Synchronous Motor versus BLDC Motor . . . . . . . . . . . . . . 58
6.5
DSP56F805EVM Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
6.6
Projects Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
6.7
Application Build & Execute . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
6.2 Operational Modes
This BLDC Motor Control Application with Hall Sensors can operate in
two modes:
1. Manual Operating Mode
The drive is controlled by the RUN/STOP switch (S6). The motor
speed is set by the UP (S2-IRQB) and DOWN (S1-IRQA) push
buttons; see Figure 6-1. If the application runs and motor spinning
is disabled (i.e., the system is ready) the USER LED (LED3,
shown in Figure 6-2) will blink. When motor spinning is enabled,
the USER LED is On. Refer to Table 6-1 for application states.
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System Setup
Figure 6-1. RUN/STOP Switch and UP/DOWN Buttons
at DSP56F805EVM
Figure 6-2. USER and PWM LEDs at DSP56F805EVM
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Operational Modes
Table 6-1. Motor Application States
Application State
Motor State
Green LED State
Stopped
Stopped
Blinking at a frequency of 2Hz
Running
Spinning
On
Fault
Stopped
Blinking at a frequency of 8Hz
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2. PC master software (Remote) Operating Mode
The drive is controlled remotely from a PC through the SCI
communication channel of the DSP device via an RS-232 physical
interface. The drive is enabled by the RUN/STOP switch, which
can be used to safely stop the application at any time. MC master
software enables to set the required speed of the motor
PC master software displays the following information:
•
Required Speed
•
Actual Speed
•
Amplitude
•
DC-Bus Voltage
•
RUN/STOP Switch Status
•
Application Mode
Start the PC master software window’s application,
BLDC_synchro_pm_quad_encoder.pmp. Figure 6-3 illustrates the PC
master software control window after this project has been launched.
NOTE:
If the PC master software project (.pmp file) is unable to control the
application, it is possible that the wrong load map (.elf file) has been
selected. PC master software uses the load map to determine
addresses for global variables being monitored. Once the PC master
software project has been launched, this option may be selected in the
PC master software window under Project/Select Other Map File
Reload.
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System Setup
Figure 6-3. PC Master Software Control Window
6.3 Application Set-Up
Figure 6-4 illustrates the hardware set-up for the Synchronous PM
Motor Control Application with Quadrature Encoder.
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System Setup
Application Set-Up
Figure 6-4. Set-up of the BLDC Motor Control Application
using DSP56F805EVM
The system consists of the following components:
•
BLDC Motor IB23810
– supplied in kit ECMTREVAL - Evaluation Motor Board Kit
•
EVM Motor Board:
– supplied in kit with IB23810 Motor: ECMTREVAL - Evaluation
Motor Board Kit
•
DSP56F805 Board:
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System Setup
– DSP56F805 Evaluation Module, supplied as DSP56F805EVM
– or DSP56F805 Controller Board
•
The serial cable - needed for the PC master software debugging
tool only.
•
The parallel cable - needed for the Metrowerks Code Warrior
debugging and s/w loading
Freescale Semiconductor, Inc...
For detailed information, refer to the dedicated application note (see
References).
6.4 PM Synchronous Motor versus BLDC Motor
The application SW is targeted for PM Synchronous motor with
sine-wave Back-EMF shape. In this particular demo application the
BLDC motor is used instead. This is due to the availability of the BLDC
motor supplied as ECMTREVAL. Although the Back-EMF shape of this
motor is not ideally sine-wave, it can be controlled by the application SW.
The drive parameters will be even better when PMSM motor with exactly
sine-wave Back-EMF shape is used.
6.5 DSP56F805EVM Set-Up
To execute the Synchronous PM Motor Control with Quadrature
Encoder, the DSP56F805EVM board requires the strap settings shown
in Figure 6-5 and Table 6-2.
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DSP56F805EVM Set-Up
JG6
3
1
9
6
3
3
JG10
3
7
2
4
1
1
JG14 JG12
3
2
1
JG13
USER
7
4
1
JG14
JG10
PWM
JG15
Y1
J23
JG17
JG6
1
3
2
1
1
JTAG
DSP56F805EVM
JG15 JG1 JG2
1
1
1
JG13
JG12
JG16
1
JG4
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2
3
J24
3
2
1
1
1
JG18
JG16
U1
JG3
J29
JG8
JG8
1
S/N
3
U15
S4
S5
S6
GP1
S1
GP2
S2
RUN/STOP
S3
P3 IRQA
IRQB
RESET
JG7
1
JG9
JG2
7
JG4
1
9
6
3
JG1
8
1
LED3
JG11
P1
U9
JG5
JG5
U10
P1
3
JG9
1
JG3
3
2
JG18
7
JG17
1
JG7
JG11
8
Figure 6-5. DSP56F805EVM Jumper Reference
Table 6-2. DSP56F805EVM Jumper Settings
Jumper Group
Comment
JG1
PD0 input selected as a high
1-2
JG2
PD1 input selected as a high
1-2
JG3
Primary UNI-3 serial selected
1-2, 3-4, 5-6, 7-8
JG4
Secondary UNI-3 serial selected
1-2, 3-4, 5-6, 7-8
JG5
Enable on-board parallel JTAG Command Converter
Interface
NC
JG6
Use on-board crystal for DSP oscillator input
2-3
JG7
Select DSP’s Mode 0 operation upon exit from reset
1-2
JG8
Enable on-board SRAM
1-2
JG9
Enable RS-232 output
1-2
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Table 6-2. DSP56F805EVM Jumper Settings
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Jumper Group
Comment
Connections
JG10
Secondary UNI-3 Analog temperature input unused
NC
JG11
Use Host power for Host target interface
1-2
JG12
Primary Encoder input selected for quadrature encoder
signals
2-3, 5-6, 8-9
JG13
Secondary Encoder input selected
2-3, 5-6, 8-9
JG14
Primary UNI-3 3-Phase Current Sense selected as Analog
Inputs
2-3, 5-6, 8-9
JG15
Secondary UNI-3 Phase A Over-current selected for
FAULTA1
1-2
JG16
Secondary UNI-3 Phase B Over-current selected for
FAULTB1
1-2
JG17
CAN termination unselected
NC
JG18
Use on-board crystal for DSP oscillator input
1-2
NOTE:
When running the EVM target system in a stand-alone mode from Flash,
the JG5 jumper must be set in the 1-2 configuration to disable the
command converter parallel port interface.
6.6 Projects Files
The Synchronous PM Motor Control application is composed of the
following files:
•
...\bldc_synchro_pm_quad_encoder_sa\bldc_synchro_pm_qua
d_encoder_sa.c, main program
•
...\bldc_synchro_pm_quad_encoder_sa\bldc_synchro_pm_qua
d_encoder_sa.mcp, application project file
•
....\bldc_synchro_pm_quad_encoder_sa\ApplicationConfig\app
config.h, application configuration file
•
...\bldc_synchro_pm_quad_encoder_sa\SystemConfig\ExtRam
\linker_ram.cmd, linker command file for external RAM
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Projects Files
•
...\bldc_synchro_pm_quad_encoder_sa\SystemConfig\Flash\li
nker_flash.cmd, linker command file for Flash
•
...\bldc_synchro_pm_quad_encoder_sa\SystemConfig\Flash\fl
ash.cfg, configuration file for Flash
•
...\bldc_synchro_pm_quad_encoder_sa\PCMaster\bldc_synchr
o_pm_quad_encoder.pmp, PC master software file
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These files are located in the application directory.
Motor Control algorithms used in the application:
•
...\controllers.c, .h: source and header files for PI controller
•
...\ramp.c, .h: source and header files for ramp controller
•
...\sinquad.c, .h: source and header files with the sine look-up
table
•
...\trigon.c, .h: source and header files for sine calculation funcion
•
...\mcgen.c, .h: source and header files for three-phase sine wave
generation
In stand-alone application, all the necessary resources (algorithms and
peripheral drivers) are part of the application project file:
•
...\bldc_synchro_pm_quad_encoder_sa\src\include, folder for
general C-header files
•
...\bldc_synchro_pm_quad_encoder_sa\src\dsp56805, folder
for the device specific source files, e.g. drivers
•
...\bldc_synchro_pm_quad_encoder_sa\src\pc_master_suppor
t, folder for PC master software source files
•
...\bldc_synchro_pm_quad_encoder_sa\src\algorithms\,
folder for algorithms
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6.7 Application Build & Execute
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When building the Synchronous PM Motor Control Application with
Quadrature Encoder, the user can create an application that runs from
internal Flash or External RAM. To select the type of application to build,
open the bldc_synchro_pm_quad_encoder.mcp project and select the
target build type, as shown in Figure 6-6. A definition of the projects
associated with these target build types may be viewed under the
Targets tab of the project window.
Figure 6-6. Target Build Selection
The project may now be built by executing the Make command, as
shown in Figure 6-7. This will build and link the Synchronous PM Motor
Control Application with Quadrature Encoder and all needed Metrowerks
and Quick_Start libraries.
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System Setup
Application Build & Execute
Figure 6-7. Execute Make Command
To execute the Synchonous PM Motor Control application, select
Project\Debug in the CodeWarrior IDE, followed by the Run command.
For more help with these commands, refer to the CodeWarrior tutorial
documentation in the following file located in the CodeWarrior
installation directory:
<...>\CodeWarrior Documentation\PDF\Targeting_DSP56800.pdf
If the Flash target is selected, CodeWarrior will automatically program
the internal Flash of the DSP with the executable generated during Build.
If the External RAM target is selected, the executable will be loaded to
off-chip RAM.
Once Flash has been programmed with the executable, the EVM target
system may be run in a stand-alone mode from Flash. To do this, set the
JG5 jumper in the 1-2 configuration to disable the parallel port, and press
the RESET button.
Once the application is running, move the RUN/STOP switch to the RUN
position and set the required speed using the UP/DOWN push buttons.
Pressing the UP/DOWN buttons should incrementally increase the
motor speed until it reaches maximum speed. If successful, the BLDC
motor will be spinning.
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NOTE:
If the RUN/STOP switch is set to the RUN position when the application
starts, toggle the RUN/STOP switch between the STOP and RUN
positions to enable motor spinning. This is a protection feature that
prevents the motor from starting when the application is executed from
CodeWarrior.
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You should also see a lighted green LED, which indicates that the
application is running. If the application is stopped, the green LED will
blink at a 2Hz frequency. If an Undervoltage fault occurs, the green LED
will blink at a frequency of 8Hz.
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Appendix A. References
1. Brushless DC Motor Control using the MC68HC708MC4, John
Deatherage and Jeff Hunsinger, AN1702/D, Motorola
Freescale Semiconductor, Inc...
2. DSP56F80x MC PWM Module in Motor Control Applications,
Leos Chalupa, AN1927/D, Motorola
3. Design of Brushless Permanent-magnet Motors, J.R.
Hendershot JR and T.J.E. Miller, Magna Physics Publishing and
Clarendon Press, 1994
4. CodeWarrior for Motorola DSP56800 Embedded Systems,
CWDSP56800, Metrowerks 2001
5. DSP56F800 16-bit Digital Signal Processor, Family Manual,
DSP56F800FM/D, Motorola 2001
6. DSP56F80x 16-bit Digital Signal Processor, User’s Manual,
DSP56F801-7UM/D, Motorola 2001
7. DSP56F805 Evaluation Module Hardware User’s Manual,
DSP56F805EVMUM/D, Motorola 2001
8. Evaluation Motor Board User’s Manual, MEMCEVMBUM/D,
Motorola
9. Motorola SPS web page: http://www.motorola.com/
10. 3-Phase BLDC Motor Control with Hall Sensors Using
DSP56F80x, Pavel Grasblum, AN1916/D, Motorola 2001
DRM029 — Rev 0
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References
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References
11. 3-Phase BLDC Motor Control with Quadrature Encoder Using
DSP56F80x, Pavel Grasblum, AN1915/D, Motorola 2001
12. 3-Phase PM synchronous Motor Vector Control using
DSP56F80x, Libor Prokop and Pavel Grasblum, AN1931/D,
Motorola 2001
Freescale Semiconductor, Inc...
13. 3-Phase PM Synchronous Motor Control with Quadrature
Encoder Using DSP56F80x, Pavel Grasblum, AN1917/D,
Motorola 2001
Designer Reference Manual
66
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References
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Freescale Semiconductor, Inc.
Designer Reference Manual — 3-Ph PM SMC with Quadrature Encoder
Appendix B. Glossary
AC — Alternative Current.
Freescale Semiconductor, Inc...
ADC — See “analogue-to-digital converter”.
brush — A component transfering elektrical power from non-rotational
terminals, mounted on the stator, to the rotor
BLDC — Brushless dc motor.
commutation — A process providing the creation of a rotation field by
switching of power transistor (electronic replacement of brush and
commutator)
commutator — A mechanical device alternating DC current in DC
commutator motor and providing rotation of DC commutator motor
COP — Computer Operating Properly timer
DC — Direct Current.
DSP — Digital Signal Prosessor.
DSP56F80x — A Motorola family of 16-bit hybrid controller dedicated for
motor control.
DT — see “Dead Time (DT)”
Dead Time (DT) — short time that must be inserted between the turning
off of one transistor in the inverter half bridge and turning on of the
complementary transistor due to the limited switching speed of the
transistors.
duty cycle — A ratio of the amount of time the signal is on versus the
time it is off. Duty cycle is usually represented by a percentage.
GPIO — General Purpose Input/Output.
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Glossary
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Glossary
Hall Sensors - A position sensor giving six defined events (each 60
electrical degrees) per electrical revolution (for 3-phase motor)
interrupt — A temporary break in the sequential execution of a program
to respond to signals from peripheral devices by executing a subroutine.
Freescale Semiconductor, Inc...
input/output (I/O) — Input/output interfaces between a computer
system and the external world. A CPU reads an input to sense the level
of an external signal and writes to an output to change the level on an
external signal.
JTAG — Interface allowing On-Chip Emulation and Programming.
LED — Lignt Emiting Diode
logic 1 — A voltage level approximately equal to the input power voltage
(VDD).
logic 0 — A voltage level approximately equal to the ground voltage
(VSS).
PI controller — Proportional-Integral controller.
phase-locked loop (PLL) — A clock generator circuit in which a voltage
controlled oscillator produces an oscillation which is synchronized to a
reference signal.
PM — Permanent Magnet
PMSM - Permanent Magnet Synchronous Motor.
PWM — Pulse Width Modulation.
Quadrature Decoder — A module providing decoding of position from
a quadrature encoder mounted on a motor shaft.
Quad Timer — A module with four 16-bit timers.
reset — To force a device to a known condition.
RPM — Revolutions per minute.
SCI — See "serial communication interface module (SCI)."
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Glossary
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Glossary
serial communications interface module (SCI) — A module that
supports asynchronous communication.
serial peripheral interface module (SPI) — A module that supports
synchronous communication.
software — Instructions and data that control the operation of a
microcontroller.
Freescale Semiconductor, Inc...
software interrupt (SWI) — An instruction that causes an interrupt and
its associated vector fetch.
SPI — See "serial peripheral interface module (SPI)."
timer — A module used to relate events in a system to a point in time.
DRM029 — Rev 0
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Designer Reference Manual
Glossary
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Glossary
Designer Reference Manual
70
DRM029 — Rev 0
Glossary
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Freescale Semiconductor, Inc.
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