永磁无刷直流电机换相转矩脉动的抑制研究

Research on permanent magnet brushless dc motor commutation torque ripple

永磁无刷直流电机因其自身结构与换相方法的特质,导致其在运行过程中存在较大的换相转矩脉动,阻碍了它在高精尖领域中的运用.针对这一问题,本文将通过滞环电流控制策略对实际相电流与给定的参考电流进行实时对比,使电机能够获得合理的触发信号.最后,利用MATLAB软件进行仿真验证,该策略成功地削弱了换相转矩脉动,完善了永磁无刷直流电机的工作特性.

As the permanent magnet brushless DC inherent structural characteristics as well as the commutation control method used,resulting in the presence of a large torque ripple during operation,limiting its application in high-precision systems. To solve this problem,this paper uses hysteresis current control strategy,by comparing the actual current and the reference current so that the motor can be obtained at the time of the commutation signal for the trigger in order to change to maintain the non-commutation phase current remains constant to the period,minus small commutation torque ripple. Finally,MATLAB simulation results show that this method can effectively suppress commutation torque ripple and improve the operational stability of the permanent magnet brushless DC motor.