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Improved Angular Displacement Estimation Based on Hall-Effect Sensors for Driving a Brushless Permanent-Magnet Motor

Improved Angular Displacement Estimation Based on Hall-Effect Sensors for Driving a Brushless Permanent-Magnet Motor

Abstract:

We  propose  an  improved  method  for  angular  displacement  estimation  based  on  Hall-effect  sensors  for  driving  a brushless  permanent-magnet  (PM)  motor.  The control current              with an angle that leads to the backelectromotive force is then determined to extend the speed range of the motor. Traditionally,  Hall-effect  signals  are  measured  by  both  the  capture  interrupt        and  periodic  timer  interrupt  functions  before  the  angular  displacement  is  precisely  estimated  with  a  digital  signal  processor.     Unfortunately, the capture interrupt function is highly sensitive to external noise. The proposed method retains the periodic timer interrupt function and simplifies the estimation operation, so the controller is robust to external disturbances.  We used the improved method to adjust the phase lead angle for driving both a surface mounted PM motor and an interior PM synchronous motor.   Experimental results show that the improved    angular    displacement estimation effectively rejects noise and is 2.9 times faster than the traditional approach.

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