非理想反电势无刷直流电机转矩直接控制方法

Torque direct control method for BLDC motors with non-ideal back EMF waveforms

为了抑制非理想反电势无刷直流电机的转矩脉动,提出一种转矩直接控制方法。将转矩参考值和反馈值输入到转矩控制器之后经过计算得到所要求的占空比,来控制相应的开关管。该方法采用两相导电方式,并在绕组换相期间考虑了直流电源有限的供电能力。仿真和实验表明,与普通的方波电流控制相比,该控制方法能有效抑制由非理想反电势引起的无刷直流电机的转矩脉动。

This paper presents a torque direct control method for BLDC （brushless dc） motors with non-ideal back EMF （electromagnetic force） waveforms. The electromagnetic torque is directly controlled to restrain torque ripples caused by the non-ideal back EMF waveforms. A duty cycle value, used to control the switching, is calculated by comparing the reference torque to the feedback torque in the torque controller. The system uses a two-phase energizing mode with consideration of the finite capacity of the dc voltage supply during the commutation intervals. Simulations and test results show that the torque direct control method restrains torque ripples in BLDC motors with non-ideal back EMF waveforms more efficiently than conventional rectangular current control.