Non-contact Torque Sensor for Electric Power Steering

Features
Applications
■ Dual torque outputs
■ Column drive steering systems
■ Non-contacting sensor technology
■ Rack drive steering systems
■ Production proven design
■ Pinion drive steering systems
■ Electronic calibration
■ ±4 ° to ±10 ° torque angle ranges available
■ Self-diagnostics and diagnostic output
Non-Contacting Torque Sensor for Electric Power Steering with Parallel Outputs
Introduction
Bourns® Torque Sensors offer non-contacting solutions for column, rack and pinion drive electric power steering systems. Based
on production proven technology, Bourns® Torque Sensors meet the full range of steering system design requirements including
resolution, accuracy, and repeatability. Simple installation and electronic calibration ensure efficient and accurate system integration.
Dual parallel slope outputs facilitate system interface and together with sensor self-diagnostics, provide enhanced system reliability.
Electrical Specifications1
Operating Voltage ..............................................5.0 vdc ±0.5 vdc
Output Voltage .................................... Analog ratiometric, PWM
Torque Angle Accuracy
(includes Linearity) ..................................................1 % of FS2
Torque Angle Resolution ........................................ 0.02 % of FS
Electrical/Magnetic Hysteresis ................................. 0.1 % of FS
Sensor Power Current Draw........................................... < 10 mA
Source Current, 10 kΩ Load ............................................ ≤ 1 mA
Mechanical Specifications
Mechanical Hysteresis .......................................................... N/A
Torque Angular Range ............................................. ±4 ° to ±10 °
Total Angular Travel ............................................... ±720 ° typical
Environmental Specifications
Operating Temperature Range ..........................-40 °C to +65 °C
Storage Temperature Range ........................... -40 °C to +85 °C3
Dither Life @ 25 °C ...........................................3.5 million @ ±5 °
Life @ -40 °C to +65 °C .......................................2 million ±360 °
1
Each output.
2 Preliminary.
3 Column drive systems. Contact Bourns for rack drive and
pinion drive systems requiring a +125°C temperature range.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Performance4
EPS Torque Sensor
with Dual Parallel Outputs
100
T1
T2
80
60
40
20
0
-20
0
20
60
80
100
120
Torque Angle (% of Range)
T1
T2
4 Typical performance for a torque angle range of ±4.5 °.
Each output has a common source.
Non-Contacting Torque Sensor for Electric Power Steering with Parallel Outputs
Product Dimensions
Dimensions and specifications shown are typical. Sensor wire harness supplied with customer-specified sealing grommet and
electrical connector. The Bourns® Torque Sensor can be mechanically and electrically modified to meet the customer’s specific
packaging requirements. Please contact Bourns with your application requirements.
80
21
DIMENSIONS: MM
Europe:
Bourns Sensors GmbH
Robert-Bosch-Str. 14
D-82054 Sauerlach
Phone: +49 (0) 8104 646-0
The Americas:
Bourns, Inc.
1660 N. Opdyke Road, Ste. 200
Auburn Hills, MI 48326-2655 USA
Phone: +1 248 926-4088
Asia:
Bourns, Inc.
10F, No. 146, Sung Jiang Road
Taipei, Taiwan, 104 PRC
Phone: +886 2 2562-4117
www.bourns.com
[email protected]
04/11
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.