基于比例谐振的无刷直流电机电流规划控制

摘要

The brushless DC motor (BLDCM) operating in the three-phase six-state mode has a large commutation torque ripple, and the current planning control according to the back EMF of BLDCM can reduce the torque ripple.However, the BLDCM winding inductances cause the phase current to lag behind the back EMF, resulting in an increase of the phase current and torque ripple.The paper proposed a current planning control method based on proportional resonance (PR) control.According to the Fourier expansion of the planned current trajectory, the method used PR controller to control the current fundamental wave and the main higher harmonics, respectively.Finally, the simulation results show that the proposed method can reduce the lag angle of phase current, suppress torque ripple and reduce the copper loss.%在三相六状态模式下工作的BLDCM存在较大的换相转矩脉动, 采用电机反电势对电流波形进行规划的控制方法可以减小该转矩脉动.然而由于绕组电感的存在, 会引起相电流滞后该相反电势的现象, 从而导致电机相电流有效值和转矩脉动的增加.论文提出一种基于比例谐振的电流规划控制方法.该方法根据规划电流轨迹的傅里叶展开, 采用基于比例谐振的电流环分别实现对电流基波和主要高次谐波的控制.最后, 仿真结果表明所提出的方法可以减小相电流的滞后角度, 抑制转矩脉动和减小电机铜耗.