Controlling of wheel motor in electric vehicle with low resolution hall effect sensors

LUAN Jie， CHEN Yang-sheng
（College of Electric Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract： In order to improve the accuracy of rotor position and speed estimated by low resolution Hall effect sensors，several different methods to obtain high resolution rotor position from the low resolution Hall sensors were described and compared with experimental test. Then a novel method to adjust rotor position gradually rather than immediately force to reference angle while sector switching and a new algorism to adjust reference angle automatically were proposed. Finally，a drive system was set with a control software coded based on TMS320F28035 as a platform to test the algorism. The experimental results indicate that the new method is capable of improving rotor speed and position with higher accuracy and lower error. And it lays a good foundation for further experiment in electric vehicle applications.
Key words： electric vehicle； permanent magnet synchronous motor （PMSM）； low resolution； hall effect sensor； wheel motor; control