ETC DRM036

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Freescale Semiconductor, Inc.
Sine Voltage
Powered 3-Phase
Permanent Magnet
Synchronous Motor
with Hall Sensors
Designer Reference
Manual
M68HC08
Microcontrollers
DRM036/D
Rev. 0, 03/2003
MOTOROLA.COM/SEMICONDUCTORS
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Sine Voltage Powered
3-Phase Permanent Magnet
Synchronous Motor with
Hall Sensors
Designer Reference Manual — Rev 0
by: Jiri Ryba
Motorola Czech Systems Laboratories
Roznov pod Radhostem, The Czech Republic
DRM036 — 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
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The following revision history table summarizes changes contained in
this document. For your convenience, the page number designators
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Revision history
Date
Revision
Level
January,
2003
1
Description
Initial revision
Designer Reference Manual
Page
Number(s)
N/A
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Designer Reference Manual — Sine Voltage Powered 3-ph PMS Motor
List of Sections
Section 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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Section 2. System Description. . . . . . . . . . . . . . . . . . . . . 17
Section 3. Hardware Design. . . . . . . . . . . . . . . . . . . . . . . 25
Section 4. Software Design . . . . . . . . . . . . . . . . . . . . . . . 35
Section 5. Application Setup . . . . . . . . . . . . . . . . . . . . . . 47
Appendix A. References. . . . . . . . . . . . . . . . . . . . . . . . . . 57
Appendix B. Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
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List of Sections
Designer Reference Manual
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Designer Reference Manual — Sine Voltage Powered 3-ph PMS Motor
Table of Contents
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Section 1. Introduction
1.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
1.2
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
1.3
Brief Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.4
68HC908MR32 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Section 2. System Description
2.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
2.2
Application Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.3
Target Motor Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Section 3. Hardware Design
3.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
3.2
Hardware Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.3
MC68HC908MR32 Control Board . . . . . . . . . . . . . . . . . . . . . . 26
3.4
3-Phase BLDC Low Voltage Power Stage . . . . . . . . . . . . . . . . 28
3.5
EVM Motor Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
3.6
Hardware Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Section 4. Software Design
4.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
4.2
Software Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.3
Software Data Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
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Table of Contents
4.4
Software Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.5
PC Master Software (Remote) Operating Mode. . . . . . . . . . . . 45
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Section 5. Application Setup
5.1
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
5.2
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.3
Hardware Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.4
Software Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
5.5
Executing the Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Appendix A. References
Appendix B. Glossary
Designer Reference Manual
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Designer Reference Manual — Sine Voltage Powered 3-ph PMS Motor
List of Tables
Table
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3-1
3-2
3-3
3-4
5-1
5-2
Title
Page
Electrical Characteristics of Control Board . . . . . . . . . . . . . . . . 28
Electrical Characteristics of the 3-Ph BLDC
Low Voltage Power Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Electrical Characteristics of the EVM Motor Board. . . . . . . . . . 31
Characteristics of the BLDC motor . . . . . . . . . . . . . . . . . . . . . . 32
MCHC908MR32 Board Jumper Settings . . . . . . . . . . . . . . . . . 49
Motor Application States. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
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List of Tables
Designer Reference Manual
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Designer Reference Manual — Sine Voltage Powered 3-ph PMS Motor
List of Figures
Figure
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2-1
2-2
2-3
2-4
2-5
3-1
3-2
3-3
4-1
4-2
4-3
4-4
4-5
5-1
5-2
5-3
5-4
5-5
5-6
Title
Page
System Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Three Phase Permanent Magnet Motor - Cross Section . . . . . 20
Voltage is 90° Relative to Rotor Flux . . . . . . . . . . . . . . . . . . . . 22
Stator Current is 90° Relative to Rotor Flux . . . . . . . . . . . . . . . 23
Voltage Vector in the Direction of the Current Vector. . . . . . . . 23
H/W System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
MC68HC908MR32 Control Board . . . . . . . . . . . . . . . . . . . . . . 27
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Main Data Flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Calculation of Hall Sensor Period . . . . . . . . . . . . . . . . . . . . . . . 38
Difference between Motor Position
and Generated Sine Wave . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Control with Minimal Reactive Power . . . . . . . . . . . . . . . . . . . . 42
Measured Reactive Power for Different Torque and Speed . . . 43
H/W System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
MC68HC908MR32 Jumper Reference. . . . . . . . . . . . . . . . . . . 49
Target Build Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
MC68HC908MR32 Board - Control Elements . . . . . . . . . . . . . 53
USER LEDs, PWM LEDs, and RESET . . . . . . . . . . . . . . . . . . 53
PC master software control window . . . . . . . . . . . . . . . . . . . . .55
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List of Figures
Designer Reference Manual
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Designer Reference Manual — Sine Voltage Powered 3-ph PMS Motor
Section 1. Introduction
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1.1 Contents
1.2
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
1.3
Brief Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.4
68HC908MR32 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.2 Overview
This reference design describes the control of a 3-phase PMS
(Permanent Magnet Synchronous) motor with Hall sensors powered by
a sine voltage. It is based on Motorola’s 68HC908MR32 microcontroller
dedicated for motor control applications. This reference design includes
a brief description of the Motorola 68HC908MR32 features, basic motor
theory, system design concept, hardware implementation and software
design including the PC Master visualization tool.
1.3 Brief Description
The application demonstrates the control of a 3-phase permanent
magnet synchronous drive with Hall sensors. It is based on Motorola’s
MC68HC908MR32 microcontroller.
The application is designed to get the lowest possible audible noise level
of the motor. The motor is powered by a sinusiodal voltage. The position
of the rotor is sensed by means of Hall-effect sensors. The generated
voltage waveform is synchronized with the rotor position by a
phase-locked loop algorithm (PLL). The motor speed is controlled by
means of the voltage amplitude. The voltage frequency is generated to
match the actual speed of the motor. It allows both closed and open-loop
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Introduction
speed control. This PMS motor control application with Hall sensors
operates in two modes:
1. Manual operating mode
2. PC master software (remote) operating mode
1.4 68HC908MR32 Features
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The MC68HC908MR32 is a member of the low-cost, high-performance
M68HC08 Family of 8-bit microcontroller units (MCUs). The M68HC08
Family is based on the customer-specified integrated circuit (CISC)
design strategy. All MCUs in the family use the enhanced M68HC08
central processor unit (CPU08) and are available with a variety of
modules, memory sizes and types, and package types:
Features of the MC68HC908MR32 include:
•
High-performance M68HC08 architecture
•
Fully upward-compatible object code with M6805, M146805, and
M68HC05 Families
•
8-MHz internal bus frequency
•
32Kbytes of on-chip electrically erasable in-circuit programmable
Read Only Memory (FLASH)
•
On-chip programming firmware for use with host personal
computer
•
Flash data security
•
768 bytes of on-chip Random Access Memory (RAM)
•
12-bit, 6-channel center-aligned or edge-aligned pulse width
modulator with optional independent and complementary mode
•
Serial peripheral interface module (SPI)
•
Serial communications interface module (SCI)
•
16-bit, 4-channel timer interface module (TIMA)
•
16-bit, 2-channel timer interface module (TIMB)
•
Clock generator module (CGM)
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Introduction
68HC908MR32 Features
Low-voltage inhibit (LVi) module with software selectable trip
points
•
10-bit, 10-channel analog-to-digital converter (ADC) with
multiplexed inputs
•
Computer operating properly (COP) watchdog timer
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•
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Introduction
Designer Reference Manual
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Designer Reference Manual — Sine Voltage Powered 3-ph PMS Motor
Section 2. System Description
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2.1 Contents
2.2
Application Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.3
Target Motor Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2.2 Application Features
The control strategy is designed to optimally utilize features of controller
68HC908MR32. The application provides following features:
•
sine voltage powered 3-phase PM synchronous motor
•
position sensing using three Hall sensors
•
low audible noise of motor
•
closed or open speed loop operation
•
high motor efficiency
•
motor deceleration (energy is returned to the dc-bus)
•
DC-Bus voltage ripple cancellation
•
manual (speed pot, start-stop switch) / PC master control (RS 232)
•
recognition of the spinning motor after CPU reset
•
limitation of dc-bus over-voltage during deceleration
•
over voltage protection
•
over current protection
•
dc-bus voltage sensing
•
PC master software
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System Description
•
memory requirements
– RAM 135 Bytes
– Flash 3485 Bytes
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The Figure 2-1 shows the system concept of the designed application.
The application was designed to control a PMS motor driving a
ventilator. Speed of the motor is controlled by the amplitude of the
voltage vector. The direction of the voltage vector depends on the rotor
position. The PLL is used to synchronize the calculated vector position
with the actual one. The calculated position is updated in PWM reload at
16kHz. The position resolution is 216 points per period.
This application uses the Hall sensors to obtain the rotor position. The
Hall sensor consists of three sensors (Sensor A, Sensor B, Sensor C).
The HC908MR32 control board contains EOR logic, which reflect
change of any sensor to the one output. This output is connected to the
Timer A channel 2. The example application, which is a subject of this
design uses three hall sensors, however, the control algorithm can be
used to control a motor having only one Hall senor. In this case the
merits of this design are much more obvious.
The PI controller is used to control the speed of motor. The output of the
controller sets the desired value of the phase voltage amplitude. The
voltage ripple cancellation block recalculates the absolute voltage value
to the value, which is relative to the actual dc-bus voltage level. This
minimizes the influence of the dc-bus voltage changes (ripples) to the
generated phase voltage.
The deceleration control algorithm controls the deceleration of the motor
to avoid dc-bus over-voltage. In this application the maximum voltage is
kept at 16V.
The application also contains PC master software, which supports
communication between the target microcontroller and PC via an RS232
serial interface. This tool allows a real- time access to any memory
location of the target processor. The user can debug or remotely control
the application, using a user-friendly graphical interface.
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System Description
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System Description
Application Features
DC-Bus Voltage
Sensing
3-ph
PMS
Motor
3-ph
Inverter
12V DC
Ref.
DC-Bus
- + Current
Required
Voltage
Voltage
Ripple
Cancellation
Relative
Voltage
Hall Sensor Signals
START/STOP
PWM
ADC
Fault
Port A
3-ph Sine Wave
Generator
Speed PI
Controller
Required
Speed
-
-
Actual
Speed
1/T
PLL
Port F
SPEED POT.
Period
Calculation,
Position
Recognition
Port E
Required
Angle
ADC
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Sensing
Deceleration
Control
Commutation
Period
EOR
68HC908MRx
Figure 2-1. System Concept
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System Description
2.3 Target Motor Theory
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The PMS (Permanent Magnet 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.
In this respect, the PMS motor is equivalent to an induction motor where
the air gap magnetic field is produced by a permanent magnet
(see Figure 2-2). The use of a permanent magnet to generate a
substantial air gap magnetic flux makes it possible to design highly
efficient PMS motors. The PMS motors provide a range of advantages
in the design of modern motion control systems, such as high efficiency,
high torque per volume and low moment of inertia.
Stator
Stator winding
(in slots)
Shaft
Rotor
Air gap
Permanent magnets
Figure 2-2. Three Phase Permanent Magnet Motor - Cross Section
A PMS motor is driven by sine wave 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 sine wave 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.
To perform electronic control the rotor position has to be either sensed
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System Description
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System Description
Target Motor Theory
by position sensors or calculated by means of sensorless control
algorithm.
The presented application uses the Hall sensors to sense actual position
of the rotor. The sensor output is read by the MCU, and used for
synchronizing the generated sine wave.
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The PMS motor model is defined by the following equations:
dψ s
U s = r s ⋅ I s + --------dt
(EQ 2-1.)
ψs = Ls ⋅ Is + ψr
(EQ 2-2.)
T e = I s ⋅ ψ ⋅ sin ( ∠I s, ψ ) = I s ⋅ ψ r ⋅ sin ( ∠I s, ψ r )
(EQ 2-3.)
where:
•
Us -
•
Is
•
Space vector of stator voltage
- Space vector of stator current
rs- Stator resistance
•
Ψ
•
Ψ r - Space vector of rotor magnetic flux evoked by the permanent
- Space vector of magnetic flux
magnet
•
•
Te- Electrical torque
∠i s, ψ r
is angle between vectors of stator current and rotor
magnetic flux
The speed of the motor can be controlled by an amplitude of the voltage
vector, while the direction of the voltage vector depends on the rotor
position. Several methods can be used to control the voltage vector
direction.
The three basic method are:
1. vector of stator voltage is placed 90° relative to the vector of rotor
magnetic flux
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System Description
2. vector of stator current is kept 90° relative to the vector of rotor
magnetic flux
3. voltage vector is kept in the direction of the current vector.
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It is desired to run the motor with maximum efficiency. In this case, the
angle of current is higher than 90° relative to the rotor magnetic flux, but
lower than in method 3, where the current has the same direction as the
voltage. The motor parameters have to be known, or some experimental
control strategy has to be used to achieve this criterion.
2.3.1 Vector of Stator Voltage Is Placed 90° Relative to the Vector of Rotor Magnetic Flux
The control strategy keeps the vector of stator voltage at 90° relative to
the vector of rotor magnetic flux. This control strategy is shown in
Figure 2-3. The advantage of this strategy is a simplicity. The only
feedback signal needed for driving the motor is the rotor position. The
presented application is based on this control strategy with some
enhancements to achieve the best efficiency of the motor.
jω.Ls.Is
Us
Rs I s
E
90°
Ψs
Ψ
Is
Ψr
Figure 2-3. Voltage is 90° Relative to Rotor Flux
2.3.2 Vector of Stator Current Is Kept 90° Relative to the Vector of Rotor Magnetic Flux
This situation is shown in Figure 2-4. As can be seen from equation
(EQ 2-3.) the optimal torque is generated when the vector of the stator
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System Description
Target Motor Theory
current is placed 90° relative to the rotor magnetic flux space-vector. In
this case the maximal utilization of the motor’s magnetic is obtained. The
control strategy requires current sensing.
jω.Ls.Is
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Us
RsIs
E
Ψs
Ψ
Is
90°
Ψr
Figure 2-4. Stator Current is 90° Relative to Rotor Flux
2.3.3 Vector of Stator Voltage Is Kept in the Direction of the Current Vector
This situation is shown in Figure 2-5. This control strategy keeps the
current vector in the direction of the voltage vector. In this case the
electrical losses are minimized. Current sensing is also required.
jω.Ls.Is
Us
RsIs
E
Ψs
Ψ
Is
Ψr
Figure 2-5. Voltage Vector in the Direction of the Current Vector
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System Description
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Section 3. Hardware Design
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3.1 Contents
3.2
Hardware Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.3
MC68HC908MR32 Control Board . . . . . . . . . . . . . . . . . . . . . . 26
3.4
3-Phase BLDC Low Voltage Power Stage . . . . . . . . . . . . . . . . 28
3.5
EVM Motor Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
3.6
Hardware Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.2 Hardware Configuration
The system configuration is shown in Figure 3-1 It consists of:
•
68HC908MR32 controller board
•
Power Stage (3-phase BLDC Low Voltage Power Stage or EVM
Motor Board)
•
3ph PM synchronous motor with three Hall sensors
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Hardware Design
40w flat
ribbon
cable
U1
U3
J5
U2
12V DC
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J2
Hall sensor cable
M1
U1 – 68HC908MR32 MC Board
U2 – Low Voltage BLDC Power Stage or
Evaluation Motor Board
U3 – 68HC908MR32 Daughter Board
M1 – 3 phase PM Motor
Figure 3-1. H/W System Configuration
3.3 MC68HC908MR32 Control Board
Motorola’s embedded motion control series MR32 motor control board is
designed to provide control signals for 3-phase ac induction, 3-phase
brushless dc (BLDC), and 3-phase switched reluctance (SR) motors. In
combination with one of the embedded motion control series power
stages, and an optoisolation board, it provides a software development
platform that allows algorithms to be written and tested without the need
to design and build hardware. With software supplied on the CD-ROM,
the control board supports a wide variety of algorithms for ac induction,
SR, and BLDC motors. User control inputs are accepted from
START/STOP, FWD/REV switches, and a SPEED potentiometer
located on the control board. Alternately, motor commands can be
entered via a PC and transmitted over a serial cable to DB-9 connector.
Output connections and power stage feedback signals are grouped
together on 40-pin ribbon cable connector. Motor feedback signals can
be connected to Hall sensor/encoder connector. Power is supplied
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MC68HC908MR32 Control Board
through the 40-pin ribbon cable from the optoisolation board or
low-voltage power stage.
The control board is designed to run in two configurations. It can be
connected to an M68EM08MR32 emulator via an M68CBL08A
impedance matched ribbon cable, or it can operate using the daughter
board. The M68EM08MR32 emulator board may be used in either an
MMDS05/08 or MMEVS05/08 emulation system.
TERMINAL
I/F
OPTOISOLATED
RS-232 I/F
FORWARD/REVERSE
SWITCH
TACHOMETER
INPUT
START/STOP
SWITCH
EMULATOR/
PROCESSOR
CONNECTOR
dc POWER
12 Vdc
SPEED
POT
REGULATED
POWER SUPPLY
HALL EFFECT
INPUTS (3)
RESET
SWITCH
CONFIG.
JUMPERS
Freescale Semiconductor, Inc...
Figure 3-2 shows a block diagram of the board’s circuitry.
(2) OPTION
SWITCHES
PWM LEDs (6)
OPTO/POWER DRIVER I/O CONNECTOR
OVERCURRENT/
OVERVOLTAGE
INPUTS
BACK EMF
INPUTS
CURRENT/TEMP
SENSE INPUTS
PWM (6)
OUTPUTS
40-PIN RIBBON
CONNECTOR
MISC. POWER AND
CONTROL I/O
Figure 3-2. MC68HC908MR32 Control Board
The electrical characteristics in Table 3-1 apply to operation at 25°C.
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Table 3-1. Electrical Characteristics of Control Board
Freescale Semiconductor, Inc...
Characteristic
Symbol
Min
Typ
Max
Units
dc power supply voltage(1)
Vdc
10.8
12
16.5
V
Quiescent current
ICC
—
80
—
mA
Min logic 1 input voltage
(MR32)
VIH
2.0
—
—
V
Max logic 0 input voltage
(MR32)
VIL
—
—
0.8
V
Propagation delay
(Hall sensor/encoder input)
tdly
—
—
500
ns
Analog input range
VIn
0
—
5.0
V
—
—
9600
Baud
—
—
20
mA
RS-232 connection speed
PWM sink current
IPK
1. When operated and powered separately from other Embedded Motion Control tool set
products
3.4 3-Phase BLDC Low Voltage Power Stage
Motorola’s embedded motion control series low-voltage (LV) brushless
DC (BLDC) power stage is designed to run 3-ph. BLDC and PM
Synchronous motors. It operates from a nominal 12-volt motor supply,
and delivers up to 30 amps of rms motor current from a dc bus that can
deliver peak currents up to 46 amps. In combination with one of
Motorola’s embedded motion control series control boards, it provides a
software development platform that allows algorithms to be written and
tested, without the need to design and build a power stage. It supports a
wide variety of algorithms for controlling BLDC motors and PM
Synchronous motors.
Input connections are made via 40-pin ribbon cable connector J13.
Power connections to the motor are made with fast-on connectors J16,
J17, and J18. They are located along the back edge of the board, and
are labeled Phase A, Phase B, and Phase C. Power requirements are
met with a 12-volt power supply that has a 10- to 16-volt tolerance.
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3-Phase BLDC Low Voltage Power Stage
Fast-on connectors J19 and J20 are used for the power supply. J19 is
labeled +12V and is located on the back edge of the board. J20 is
labeled 0V and is located along the front edge. Current measuring
circuitry is set up for 50 amps full scale. Both bus and phase leg currents
are measured. A cycle by cycle overcurrent trip point is set at 46 amps.
Freescale Semiconductor, Inc...
The LV BLDC power stage has both a printed circuit board and a power
substrate. The printed circuit board contains MOSFET gate drive
circuits, analog signal conditioning, low-voltage power supplies, and
some of the large passive power components. This board also has a
68HC705JJ7 microcontroller used for board configuration and
identification. All of the power electronics that need to dissipate heat are
mounted on the power substrate. This substrate includes the power
MOSFETs, brake resistors, current-sensing resistors, bus capacitors,
and temperature sensing diodes. Figure 3-3 shows a block diagram.
POWER
INPUT
BIAS
POWER
BRAKE
MOSFET
POWER MODULE
SIGNALS
TO/FROM
CONTROL
BOARD
GATE
DRIVERS
TO
MOTOR
PHASE CURRENT
PHASE VOLTAGE
BUS CURRENT
BUS VOLTAGE
MONITOR
BOARD
ID BLOCK
ZERO CROSS
BACK-EMF SENSE
Figure 3-3. Block Diagram
The electrical characteristics in Table 3-2 apply to operation at 25°C with
a 12-Vdc supply voltage.
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Table 3-2. Electrical Characteristics of the 3-Ph BLDC
Low Voltage Power Stage
Freescale Semiconductor, Inc...
Characteristic
Symbol
Min
Typ
Max
Units
Motor Supply Voltage
Vac
10
12
16
V
Quiescent current
ICC
—
175
—
mA
Min logic 1 input voltage
VIH
2.0
—
—
V
Max logic 0 input voltage
VIL
—
—
0.8
V
Analog output range
VOut
0
—
3.3
V
Bus current sense voltage
ISense
—
33
—
mV/A
Bus voltage sense voltage
VBus
—
60
—
mV/V
IPK
—
—
46
A
Continuous output current
IRMS
—
—
30
A
Brake resistor dissipation
(continuous)
PBK
—
—
50
W
Brake resistor dissipation
(15 sec pk)
PBK(Pk)
—
—
100
W
Pdiss
—
—
85
W
Peak output current
(300 ms)
Total power dissipation
3.5 EVM Motor Board
Motorola’s embedded motion control series EVM motor board is a
12-volt, 4-amp, surface-mount power stage that is shipped with an MCG
IB23810-H1 brushless dc motor. In combination with one of the
embedded motion control series control boards, it provides a software
development platform that allows algorithms to be written and tested
without the need to design and build a power stage. It supports
algorithms that use Hall sensors, encoder feedback, and back EMF
(electromotive force) signals for sensorless control.
The EVM motor board does not have overcurrent protection that is
independent of the control board, so some care in its setup and use is
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EVM Motor Board
required if a lower impedance motor is used. With the motor that is
supplied in the kit, the power output stage will withstand a full-stall
condition without the need for overcurrent protection. Current measuring
circuitry is set up for 4 amps full scale. In a 25οC ambient operation at up
to 6 amps continuous RMS output current is within the board’s thermal
limits.
Freescale Semiconductor, Inc...
Input connections are made via 40-pin ribbon cable connector J1. Power
connections to the motor are made on output connector J2. Phase A,
phase B, and phase C are labeled on the board. Power requirements are
met with a single external 12-Vdc, 4-amp power supply. Two connectors,
labeled J3 and J4, are provided for the 12-volt power supply. J3 and J4
are located on the front edge of the board. Power is supplied to one or
the other, but not both. The electrical characteristics in Table 3-3 apply
to operation at 25°C and a 12-Vdc power supply voltage.
Table 3-3. Electrical Characteristics of the EVM Motor Board
Symb
ol
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
Power MOSFET On
Resistance
RDS(O
—
32
40
MΩ
RMS Output Current
IM
—
—
6
A
Pdiss
—
—
5
W
Characteristic
Total Power Dissipation
n)
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The EVM Motor Board is shipped with an MCG IB23810-H1 brushless
dc motor. The motor characteristics in Table 3-4 apply to operation at
25°C.
Table 3-4. Characteristics of the BLDC motor
Characteristic
Freescale Semiconductor, Inc...
Terminal Voltage
Symb
ol
Min
Typ
Max
Units
Vt
—
—
60
V
—
5000
—
RPM
Speed @ Vt
Torque Constant
Kt
—
0.08
—
Nm/A
Voltage Constant
Ke
—
8.4
—
V/kRP
M
Winding Resistance
Rt
—
2.8
—
Ω
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
Thermal Resistance
3.6 Hardware Documentation
All the system parts are supplied and documented according to the
following references:
•
U1 - MC68HC908MR32 Control Board:
– supplied as: ECCTR908MR32
– described in: Motorola Embedded Motion Control
MC68HC908MR32 Control Board User’s Manual
MEMCMR32CBUM/D
•
U2 - 3 ph AC/BLDC Low Voltage Power Stage
– described in: Motorola Embedded Motion Control 3-Phase
BLDC Low-Voltage Power Stage User’s Manual
MEMC3PBLDCLVUM/D
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Hardware Documentation
•
or - Evaluation Motor Board
– described in: Motorola Embedded Motion Control Evaluation
Motor Board User’s Manual
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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 — Sine Voltage Powered 3-ph PMS Motor
Section 4. Software Design
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4.1 Contents
4.2
Software Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.3
Software Data Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.4
Software Processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4.5
PC Master Software (Remote) Operating Mode. . . . . . . . . . . . 45
4.2 Software Design
This section describes the design process of control algorithm, and of
the software blocks implemented in the drive.
4.3 Software Data Flow
The control algorithm of closed loop drive for the sine voltage powered
3-phase PMS motor with Hall sensors is described in Figure 4-1. The
inputs to the algorithm are desired omega from speed pot (Manual
Control), or from remote control interface (SCI) and Hall sensor signals
(Hall Sensors). The output is a three phase PWM signal (PWM
Generation).
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Manual
Control
SCI
Hall
Sensor
PC master process
Sensor Edge
Detection
Period Calculation
PLL
Freescale Semiconductor, Inc...
omega_desired
omega_required
period_hall_sensor
Speed Ramp
Speed Calculation
omega_required_RPM
omega_measured
phase_increment
phase_measured
Field Weakening
Calculation
Speed Controller
fieldWeakening
controller_out
Sine Wave
Synchronization
Ripple Cancellation
v_phase_amplitude
phase_actual
Sine Wave
Generation
PWM
Generation
Figure 4-1. Main Data Flow
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Software Processes
4.4 Software Processes
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4.4.1 PC Master Process
A small program is resident in the MR32 that communicates with the PC
master software running on the PC. It controls data exchange between
the application and the Serial Communication Interface (SCI). The
module enables read and write to the CPU RAM and reading the whole
CPU memory. It provides a remote control interface to the application.
For control actions provided see section 4.5 PC Master Software
(Remote) Operating Mode.
4.4.2 Sensor Edge Detection
Each incoming edge on the signal from Hall sensors causes the saving
of the actual timer value and setting of the capture flag. The flag is
recognized in the following PWM reload, and it starts a task which is
divided between two PWM reloads interrupts. In the first interrupt the
sine wave is synchronized, and the period of the hall sensor signal is
calculated. In the following PWM reload interrupt, the “phase_increment”
is calculated.
4.4.3 Period Calculation
The principle of period calculation is shown in Figure 4-2. The motor
used has two pole-pairs and three Hall sensors. To eliminate the
difference between the Hall sensors, the edges from same sensor are
used for period calculation. The period is calculated on each EOR signal
edge, but for period calculation the difference between six successive
edges on EOR signal is taken.
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EOR output signal
period_hall_sensor
Figure 4-2. Calculation of Hall Sensor Period
4.4.4 Phase-Locked Loop
The phase-locked loop (PLL) provides synchronization of generated
sine voltage with Hall sensor signals, and maintains the generated
voltage vector in proper position. The frequency of the sine wave is given
by “phase_increment”. The actual angle of sine wave is increased by this
increment at each PWM reload. The new “phase_increment” is
calculated, from the difference between the Hall sensor signals and the
sine wave period. (see Figure 4-3.)
The phase increment difference ∆α is calculated as:
2⋅α
∆α = ∆T ⋅ ----------T
(EQ 4-1.)
where:
•
∆T - position difference [sec]
•
α - phase increment [deg]
•
T - phase period (T = 2562)
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Software Processes
Generated Sine Wave
0
60
120
180
240
300
360
T/2
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Position Signal from
Hall sensor
∆T – position difference
between expected and
real position
.
Figure 4-3. Difference between Motor Position
and Generated Sine Wave
The new phase increment is α expressed as:
α = C I ⋅ ∆α
(EQ 4-2.)
where CI is integral constant of PLL.
Position calculation parameters:
•
calculated position resolution 216 per period
•
position update 16 kHz
•
phase increment resolution 218 per period
4.4.5 Sine Wave Synchronization
This algorithm calculates actual phase of the generated voltage vector
(its position). The presented design uses three Hall sensors to get the
rotor position. Thus we obtain six positions per electrical revolution. The
control algorithm keeps the angle between generated voltage vector and
rotor flux at 90°. In instances between the two position readings the
position of voltage vector is estimated. When a new rotor position is read
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from Hall sensors the position of the generated voltage vector is
synchronized by means of PLL algorithm (see 4.4.4 Phase-Locked
Loop). The designed application is even able to perform high-efficient
control of a motor using only one Hall sensor for position sensing.
4.4.6 Speed Ramp
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The Speed ramp decreases the rate of required speed variation.
4.4.7 Speed Calculation
The speed ωm (EQ 4-3.) is calculated every 5ms in the timer overflow
interrupt.
C
ω m = ------ωTh
(EQ 4-3.)
where
•
Cω is a constant representing the omega scale and the number of
pole pairs.
•
Th is the Hall sensor period
4.4.8 Speed Controller
The scaled PI controller is used for the speed closed loop. The controller
is called every 5ms. The controller constants were tuned experimentally.
The frequency of speed update depends on actual motor speed
(according to the rate of incoming edges for Hall sensors). To achieve
the best results the speed controller constants are recalculated
according to the sensed speed. The controller constants are calculated
according to (EQ 4-4.) and (EQ 4-5.). The sensed speed can be updated
only when the edge on the Hall sensor signal is detected. The long
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period between the Hall sensor signal edges al low speed could cause
speed fluctuations of the motor.
CI = C1 + C2 ⋅ ωm
(EQ 4-4.)
CP = C3 + C4 ⋅ ωm
(EQ 4-5.)
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where
•
CI is integral constant
•
CP is proportional constant
•
C1,C2,C3,C4 are constants tuned experimentally
4.4.9 Voltage Ripple Cancellation
The voltage ripple cancellation recalculates the absolute required
voltage into a relative voltage, so that output voltage amplitude does not
depend on the dc-bus voltage.
U req
U rel = ---------U DC
(EQ 4-6.)
where:
•
Ureq is absolute voltage required by speed controller [V]
•
Urel is relative voltage going to sine wave generator [-]
•
UDC is dc-bus voltage [V]
The purpose of the function is to ensure that a jump in dc-bus voltage
does not cause transient speed deviation.
4.4.10 Field Weakening Calculation
A field weakening of the motor may be required to extend the full speed
range. The PMS motor can be field weakened by increasing the angle
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between motor voltage and rotor flux. The basic control keeps the angle
at 90°, as can be seen in Figure 2-3. Change of control angle is not only
useful for field weakening, but also for setting the optimal working point
of a motor. One goal of finding a working point where the motor has
maximum efficiency, can be simplified as a task of minimizing resistance
losses. In this case the reactive power has to be minimized by the correct
control angle. Figure 4-4 shows that the optimal angle is higher than in
basic control. The angle value depends on motor parameters and load
of the motor. The dependence of reactive power relative to control angle
of motor used is shown in Figure 4-5. The measured reactive power is
shown for three different torques (T1,T2,T3) and two speeds (ω1 and
ω2), where T1<T2<T3 and ω1<ω2. In the graph the ω is substituted by
w. In Figure 4-5 we can see that the optimal control angle depends on
both the speed and the torque.
jω.Ls.Is
Us
RsIs
E
Ψs
Ψ
Is
δ
Ψr
Figure 4-4. Control with Minimal Reactive Power
The designed application has the control angle δ calculated from speed
(EQ 4-7.) and is suitable for applications where the torque depends on
speed, e.g. ventilators.
δ = δ base + C δ ⋅ ω
δ max – δ base
C δ = ---------------------------ω max
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(EQ 4-7.)
(EQ 4-8.)
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where:
•
δ is control angle (angle between motor voltage and rotor
magnetic flux)
•
δbase is the control angle when speed is zero
•
δmax is the control angle when speed is maximal
reactive power
w2_T3
w1_T3
w2_T2
w1_T2
w2_T1
w1_T1
90
100
110
120
130
control angle
Figure 4-5. Measured Reactive Power for Different Torque and
Speed
Precise tuning of control angle to speed is not critical. This is because
the range of acceptable angles is comparable with the range of optimal
angles over the whole torque and speed range. Increasing the control
angle with speed allows a higher torque at maximum speed. In the
application, the minimum and maximum control angles are:
•
δbase = 101°
•
δmax = 122°
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4.4.11 Sine Wave Generation
The sine wave generation is calculated each PWM reload interrupt,
which is every 64us. The function
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sin3p3hPIxLUT (UByte u_phase_amplitude, SWord16 phase_actual);
gets the sine of the actual phase for all three phases from the table, and
multiplies it by the voltage amplitude. Resolution of the sine is 1024
points per period and, 256 points per amplitude. The function is written
in assembly to minimize execution time. The execution time is about
20us.
4.4.12 Over Voltage Limitation
Over-voltage limitation protects the power stage during deceleration. If
the dc-bus voltage exceeds maximum voltage limit the deceleration of
the motor is interrupted. The required speed is increased to keep the
dc-bus voltage under the limiting value. When the dc-bus voltage is
stabilized the deceleration of motor continues.
4.4.13 CPU Reset to Turning Motor
If the CPU is reset while the motor is running, the initialization routine
recognizes the running motor from the Hall sensor signals. Then the
speed of motor is calculated, and PLL is synchronized with the Hall
sensor signals. The voltage amplitude is estimated from the measured
speed, which helps to switch-on PWM without torque surge. CPU reset
always switches the application to manual control, even if the application
before reset was controlled by PC master software.
NOTE:
The application source code includes also “Torque Limitation” algorithm.
This feature is disabled in this application. If the limitation of motor torque
is required it may be added to the user application. The torque limitation
constants used in the algorithm depend on particular motor parameters,
therefore the user has to define his motor specific parameters. For more
details on “Torque Limitation” algorithm see AN 2357/D “Sine Voltage
Powered 3-Phase Permanent Magnet Motor with Hall Sensor”,
Motorola, 2002.
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PC Master Software (Remote) Operating Mode
4.5 PC Master Software (Remote) Operating Mode
The drive is controlled remotely from a PC via an RS-232 physical
interface. The manual control is ignored and all required values are
controlled from PC.
Freescale Semiconductor, Inc...
The actions controlled in PC master operating mode are:
•
Start/Stop control
•
Motor speed setpoint
•
Close Loop/Open Loop operation
PC master software displays the following information on a control page:
•
Speed
•
DC-Bus voltage
•
Drive status
•
Close Loop/Open Loop operation status
•
Application mode (manual/remote control)
The other variables can be viewed in the variables section.
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Software Design
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Designer Reference Manual — Sine Voltage Powered 3-ph PMS Motor
Section 5. Application Setup
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5.1 Contents
5.2
Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.3
Hardware Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.4
Software Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
5.5
Executing the Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.2 Warning
The application includes a rotating machine and power transistors. Both
can reach temperatures hot enough to cause burns. To facilitate safe
operation, 12-volt input power should come from a dc laboratory power
supply that is current limited.
The user should be aware that:
Before moving scope probes, making connections, etc., it is generally
advisable to power down the 12-volt supply.
Operation in lab setups that have grounded tables and/or chairs should
be avoided.
Wearing safety glasses, avoiding ties and jewelry, using shields, and
operation by personnel trained in power electronics lab techniques are
also advisable.
5.3 Hardware Setup
The motor control system is designed to drive the 3-phase PMS motor
in a speed closed loop using a 68HC908MR32 microcontroller. The
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Application Setup
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System configuration is shown in Figure 5-1. The system configuration
consists of:
•
Motorola MC68HC908MR32 control board
•
3-phase BLDC low voltage power stage or EVM motor board
•
PMS motor with 3 Hall sensors
•
12V DC Power supply
•
Serial cables to PC
40w flat
ribbon
cable
U1
J5
U3
U2
12V DC
J2
Hall sensor cable
M1
U1 – 68HC908MR32 MC Board
U2 – Low Voltage BLDC Power Stage or
Evaluation Motor Board
U3 – 68HC908MR32 Daughter Board
M1 – 3 phase PM Motor
Figure 5-1. H/W System Configuration
5.3.1 Controller Board Jumper Settings
To execute the PMS motor control application with Hall sensors, the
MC68HC908MR32 control board requires the jumper settings shown in
Figure 5-2 and Table 5-1
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Application Setup
Hardware Setup
Figure 5-2. MC68HC908MR32 Jumper Reference
NOTE:
The JP2 jumper must be connected
Table 5-1. MCHC908MR32 Board Jumper Settings
Jumper Group
Comment
JP1
Tacho
JP2
Encoder / Hall Sensor
JP3
BEMF_z_c
No connection
JP4
PFC_z_c
No connection
JP5
PFC_PWM
No connection
JP7
GND_Connection
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Connections
No connection
1–2
1–2
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5.4 Software Setup
5.4.1 Required Software Tools
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The application requires then following software development tools:
•
Metrowerks1CodeWarrior®2 for MC68HC08 microcontrollers
version 1.2 or later.
•
PC master software version 1.2.0.11 or later
5.4.2 Application Files
The application files are distributed in compressed zip-file:
3ph_pm_sin_3hs_sa.zip. Uncompress the files to the folder on you hard
drive. The PMS motor control application with Hall sensors is composed
of the following files:
•
3ph_pm_sin_3hs_sa.mcp, application project file
•
sources\3ph_pm_sin_3hs.c, main program
•
sources\3ph_pm_sin_3hs.h, main program header file
•
sources\appconfig.h, application configuration file for static
periphery configuration
•
prms\hc908mr32.prm, linker parameters file
•
pcmaster\3ph_pm_sin_3hs.pmp, PC master software file
Besides the application specific files listed above the application is
distributed with peripheral drivers and algorithms placed in following
folders:
•
config peripheral start-up code
•
drivers and drivers\highlevel - peripheral and high-level drivers
1. Metrowerks® and the Metrowerks logo are registered trademarks of Metrowerks, Inc., a wholly
owned subsidiary of Motorola, Inc.
2. CodeWarrior® is a registered trademark of Metrowerks, Inc., a wholly owned subsidiary of
Motorola, Inc.
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Application Setup
Executing the Application
•
algorithms - general motor control algorithms
5.4.3 Building the Application
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To build this application, open the 3ph_pm_sin_3hs_sa.mcp project
file and execute the Make command; see Figure 5-3.. This will build and
link PMS motor control application with Hall sensors along with all
needed Metrowerks libraries.
Figure 5-3. Target Build Selection
5.5 Executing the Application
To execute the PMS motor control application with Hall sensors, 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:
<...>\info\CodeWarrior\IDE_User_Guide.pdf
If the MMDS target is selected, CodeWarrior will automatically download
the program to MMDS05/08 emulator.
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Application Setup
5.5.1 Application Modes
This PMS motor control application with Hall sensors can operate in two
modes:
1. Manual operating mode
2. PC master software (remote) operating mode
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5.5.1.1 Manual Operating Mode
Refer to MC68HC908MR32 control board shown in Figure 5-4 and
Figure 5-5 for this description:
•
START/STOP switch (SW3) - start/stop of the motor
•
SPEED potentiometer (P1) - set motor speed
•
DIP switch SW2 functions:
– 1 - open/closed loop operation (ON - closed loop on)
– 2 - N/A
•
USER LED - indicates status of the drive, for detailed description
see Table 5-2.
Table 5-2. Motor Application States
Application
State
Motor
State
Green
LED State
Yellow
LED State
Red
LED State
Stopped
Stopped
Blinking at a
frequency of 2 Hz
—
—
Running
Spinning
On
—
—
Fault
Stopped
Blinking at a
frequency of 8 Hz
—
—
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Application Setup
Executing the Application
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Speed
Speed
potentiometer
Potentiometer
Fault
Fault POT
POT
Over-Voltage
Over-Voltage
Fault POT
POT
Fault
Over-Current
Over-Current
Forward
Reverse
Forward // Reverse
Switch
SW4
switch SW4
Start
Stop
Start / Stop
Switch
SW3
switch SW3
Figure 5-4. MC68HC908MR32 Board - Control Elements
Figure 5-5. USER LEDs, PWM LEDs, and RESET
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5.5.1.2 PC Master (Remote) Operating Mode
The drive is controlled remotely from a PC via an RS-232 physical
interface. The actions controlled in PC master operating mode are:
•
Start/Stop control
•
Motor speed setpoint
•
Close Loop/Open Loop operation
Freescale Semiconductor, Inc...
The PC master software displays the following information:
•
Speed
•
DC-Bus voltage
•
Drive status
•
Close Loop/Open Loop operation status
•
Application mode (manual/remote control)
Project files for PC master software are located in:
PC master software file
..\pcmaster\3ph_pm_sin_3hs.pmp
To start the PC master software’s window application
3ph_pm_sin_3hs.pmp
NOTE:
If the PC master project (.pmp file) is unable to control the application, it
is possible the wrong symbol file(.elf file) has been selected. The PC
master software uses the.elf file to determine addresses for global
variables being monitored. Once the PC master project has been
launched, this option may be selected in the PC master window under
"Project/Select Symbol File”. To reload the symbol file select
"Project/Reload Symbol File”
The PC master software control window is shown in Figure 5-6.
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Application Setup
Executing the Application
Figure 5-6. PC master software control window
5.5.2 Starting the Motor in Manual Mode
Switch the START/STOP switch to the START position and set the
required speed by the SPEED potentiometers. If successful, the PMS
motor will be spinning.
NOTE:
If the START/STOP switch is set to the START position when the
application starts, toggle the START/STOP switch between the STOP
and START positions to enable motor spinning. This is a protection
feature preventing the motor from starting when the application is
executed from CodeWarrior.
You should also see a lighted green LED, indicating the application is
running. If the application is stopped, the green LED will blink at a
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frequency of 2 Hz. If a fault occurs, the green LED will blink at a
frequency of 8 Hz.
NOTE:
In manual control mode, the SW2-1 switch on the CPU board (see
Figure 5-5) determines close/open loop (close loop is at position On).
5.5.3 Starting the Motor in Remote Control Mode (using PC Master)
Freescale Semiconductor, Inc...
To set the PC master control, perform the following steps:
1. The RUN/STOP switch must be in the STOP position
2. Check the PC master mode on the PC master control page
3. Start the motor by pressing the START PC Master Push Button
4. Set the speed with the bar graph
5. Stop the motor by pressing the STOP PC Master Push Button
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Designer Reference Manual — Sine Voltage Powered 3-ph PMS Motor
Appendix A. References
1. Electronically Commutated Motors for Fan Applications, A. Lelkes,
PCIM 2002.
Freescale Semiconductor, Inc...
2. Design of Brushless Permanent-magnet Motors, J.R. Hendershot
and T.J.E. Miller, Magna Physics Publishing and Clarendon
Press, 1994
3. AN 2357/D Sine Voltage Powered 3-Phase Permanent Magnet
Motor with Hall Sensor, Motorola, 2002
4. 68HC908MR32 User’s Manual, Motorola, Inc. (2001), (order
#:MC68HC908MR32/D)
5. Motorola Embedded Motion Control MC68HC908MR32 Control
Board User’s Manual, Motorola, 2000
(order #:MEMCEVMBUM/D)
6. Motorola Embedded Motion Control 3-Phase BLDC Low-Voltage
Power Stage User’s Manual, Motorola, 2000 (order #:
MEMC3PBLDCLVUM/D)
7. Motorola Embedded Motion Control Evaluation Motor Board
User’s Manual, Motorola, 2000
(order #:MEMCEVMBUM/D)
8. AN 1917/D 3-Phase Synchronous PM Motor Control with
Quadrature Encoder Using DSP56F80x, Motorola, 2002
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References
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Designer Reference Manual — Sine Voltage Powered 3-ph PMS Motor
Appendix B. Glossary
AC — Alternating current.
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analogue-to-digital converter (ADC) — The ADC module is an
10-channel, multiplexed-input successive-approximation
analog-to-digital converter.
brush — A component transfering electrical power from non-rotational
terminals, mounted on the stator, to the rotor
byte — A set of eight bits.
central processor unit (CPU) — The primary functioning unit of any
computer system. The CPU controls the execution of instructions.
clear — To change a bit from logic 1 to logic 0; the opposite of set.
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
comparator — A device that compares the magnitude of two inputs. A
digital comparator defines the equality or relative differences between
two binary numbers.
computer operating properly module (COP) — A counter module that
resets the MCU if allowed to overflow.
COP — Computer Operating Properly timer
DC — Direct Current.
DT — see “Dead Time (DT)”
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Glossary
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.
Freescale Semiconductor, Inc...
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.
interrupt request — A signal from a peripheral to the CPU intended to
cause the CPU to execute a subroutine.
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.
LED — Light Emitting 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).
MCU — Microcontroller unit. See “microcontroller.”
memory map — A pictorial representation of all memory locations in a
computer system.
microcontroller — Microcontroller unit (MCU). A complete computer
system, including a CPU, memory, a clock oscillator, and input/output
(I/O) on a single integrated circuit.
modulo counter — A counter that can be programmed to count to any
number from zero to its maximum possible modulus.
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Glossary
PI controller — Proportional-Integral controller.
peripheral — A circuit not under direct CPU control.
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
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PMSM - Permanent Magnet Synchronous Motor.
port — A set of wires for communicating with off-chip devices.
program — A set of computer instructions that cause a computer to
perform a desired operation or operations.
PWM — Pulse Width Modulation.
PWM period — The time required for one complete cycle of a PWM
waveform.
read — To copy the contents of a memory location to the accumulator.
register — A circuit that stores a group of bits.
reset — To force a device to a known condition.
RPM — Revolutions per minute.
SCI — See “serial communication interface module (SCI).”
serial communications interface module (SCI) — A module that
supports asynchronous communication.
serial peripheral interface module (SPI) — A module that supports
synchronous communication.
set — To change a bit from logic 0 to logic 1; opposite of clear.
software — Instructions and data that control the operation of a
microcontroller.
software interrupt (SWI) — An instruction that causes an interrupt and
its associated vector fetch.
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Glossary
SPI — See “serial peripheral interface module (SPI).”
stack — A portion of RAM reserved for storage of CPU register contents
and subroutine return addresses.
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subroutine — A sequence of instructions to be used more than once in
the course of a program. The last instruction in a subroutine is a return
from subroutine (RTS) instruction. At each place in the main program
where the subroutine instructions are needed, a jump or branch to
subroutine (JSR or BSR) instruction is used to call the subroutine. The
CPU leaves the flow of the main program to execute the instructions in
the subroutine. When the RTS instruction is executed, the CPU returns
to the main program where it left off.
timer — A module used to relate events in a system to a point in time.
variable — A value that changes during the course of program
execution.
waveform — A graphical representation in which the amplitude of a
wave is plotted against time.
word — A set of two bytes (16 bits).
write — The transfer of a byte of data from the CPU to a memory
location.
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