基于模型预测的无刷直流电机转矩脉动抑制

摘要

永磁无刷直流电机转矩脉动问题限制了其在高性能设备上的应用.针对无刷直流电机普遍存在的换相转矩脉动问题,根据电机数学模型,从持续导通相电流模型是否发生突变的角度分析了换相转矩脉动产生的原因.通过理论分析,论证了在换相阶段读取霍尔信号以切换控制模型从而实现变模型的预测控制的可行性以及该方案对转矩脉动抑制的有效性.在Matlab中搭建仿真模型对该方案进行了验证.%The torque ripple especially commutation torque ripple of permanent magnet brushless motor restricts its application in high-performance devices.Focusing on commutation torque ripple of square waves driving brushless DC motors,the torque ripple during commutation period was analyzed from the point of sudden change of noncommutated phase's current model.Theoretical inference shows that using model predictive controller with reading Hall signal to switch the current model was applicable to replace the PID controller,moreover,the reduction of torque ripple is satisfactory with this modulation.Validity of the proposed method was verified via Matlab simulation results.