表贴式永磁电机各次电流引起径向振动的机理分析及综合抑制策略

Mechanism Analysis and Comprehensive Suppression Strategy of Radial Vibration Induced by Each Current of Surface Magnet Motor

变频驱动三相永磁电机绕组中含有各频次对称电流和非对称电流,甚至还有直流分量,在电机极槽磁导调制作用下,这些电流磁场与永磁磁场相互作用都会引起电机的径向振动。该文对样机的三相电流进行分析,分别推导出基波、直流分量、对称倍频电流和非对称倍频电流的径向磁动势,根据麦克斯韦磁力公式推导出各成分电流引起的径向振动模型,通过样机验证模型的正确性。最后推导出一种多倍频电流注入法的径向振动抑制模型,并设计出一种基于多目标RMSProp优化算法的永磁电机径向振动综合抑振控制策略,通过样机实验验证了该方法的正确性和有效性。

The three-phase permanent magnet motor is driven by frequency conversion. The windings contain symmetrical current and asymmetric current of various frequencies, and even DC components. Under the modulation of the pole slot of the motor, the interaction between the current magnetic field and the permanent magnet magnetic field will cause the radial vibration of the motor. In this paper, the three-phase current of the prototype is analyzed, and the radial magnetomotive force of fundamental wave, DC component, symmetrical harmonic current and asymmetric harmonic current are deduced respectively. The radial vibration model caused by the current of each component is deduced according to Maxwell’s magnetic force formula, and the correctness of the model is verified by the prototype. Finally, a radial vibration suppression model of multi-harmonic current injection method is derived, and a comprehensive radial vibration suppression control strategy of permanent magnet motor is designed based on the multi-objective RMSProp optimization algorithm. The correctness and effectiveness of the proposed method are verified by the prototype experiment.