Fast Calculation of Electromagnetic Force and Vibration for Surface Mounted PMSM Considering Spatial Harmonic Suppression

Electromagnetic vibration (EMV) is a key indicator for the performance analysis of permanent magnet synchronous motor (PMSM), and when using finite element method (FEM) for EMV prediction analysis, the results are greatly affected by the mesh quality and calculation steps. Based on the traditional accurate subdomain method (SDM) of surface-mounted PMSM, this paper considers the space harmonic weakening method of air gap flux density (AGFD) of magnet shaping, skewed magnet, skewed slot and auxiliary slot structure, and establishes the analytical model of radial electromagnetic force (REMF) calculation and the fast prediction model of EMV. Based on the 24-slot/28-pole fractional-slot motor, the harmonic components and corresponding vibration components of the REMF of each spatial order under several structures are compared and analyzed at the main vibration frequency of $2f_{e}.$ The accuracy of the AGFD waveform calculation is verified by the FEM results, and the effectiveness of the EMV prediction model is verified by the vibration test results of the prototype.