Analysis and Reduction of Slot Frequency Vibration of PMSMs With the Force-Harmonic Coupling Model Considering Phase Angle Characteristic

This paper establishes the force-harmonic coupling model considering phase angle characteristic for analysis and reduction of slot frequency force harmonic PMSMs. Compared with traditional analytical model, significant influence on relationship among components is considered in model. Firstly, deduced based Maxwell stress tensor, contributing to harmonic, these are divided a series combinations positive negative components. Combined finite element verified. Based relationship, principle rotor-step skewing further explained as mutual compensation effect components, vibration effectively offset through choosing appropriate segment number skewed angle. Finally, optimized prototype tested, measured results good agreement FEM results.