SLYT867 June   2025 LDC5072-Q1 , MSPM0G1106 , MSPM0G1107 , MSPM0G1506 , MSPM0G1507 , MSPM0G1518 , MSPM0G1519 , MSPM0G3106 , MSPM0G3106-Q1 , MSPM0G3107 , MSPM0G3107-Q1 , MSPM0G3506 , MSPM0G3506-Q1 , MSPM0G3507 , MSPM0G3507-Q1 , MSPM0G3518 , MSPM0G3518-Q1 , MSPM0G3519 , MSPM0G3519-Q1 , TMAG5170 , TMAG6180-Q1

 

  1.   1
  2. 1 Introduction
  3. 2 Using a position sensor with brushless motor control
  4. 3 Incremental and absolute encoders
  5. 4 FOC motor-control techniques and requirements for encoders
  6. 5 Position sensor technologies
  7. 6 Magnetic position sensors
  8. 7 Linear position example with a 3D Hall-effect linear sensor
  9. 8 Rotary angle example with an AMR sensor
  10. 9 Inductive position sensing
  11. 10Conclusion
  12. 11Additional resources

2 Using a position sensor with brushless motor control

Position sensors are not just used for the commutation of stator currents with brushless-DC or brushless-AC motors, but also for speed and position control. Industrial multiaxis robots often include a gear between the motor shaft and robot axis. A rotary angle sensor coupled with the motor shaft not only needs to sense the rotor angle, but also count the turns of the motor shaft to control the equivalent absolute angle position of the corresponding robot axis. Depending on the application, the type of encoder will vary.