Aiming at problem of large torque pulsation of brushless DC motor(BLDCM) system
an improved pulse width modulation(PWM) modulation mode based on multi-Hall sensor
namely quasi-POP modulation mode
is proposed
which is applicable to all speed of BLDCM.The simulation results show that compared with the commonly used three-Hall sensor based H_PWM-L_ON modulation mode
this mode can reduce torque pulsation by 25%at low speed stage