Modeling and Analyzing for Magnetic Field of Segmented Surface-Mounted PM Motors with Skewed Poles

The skewed PM (permanent magnet) in the axial direction and the segmented PM in the circumferential direction, can reduce the cogging torque of the permanent magnet synchronous motor (PMSM). In this paper, the magnetization expression, which can be applied to different circumferential sectioning modes, is derived. The quasi-3D magnetic field analytical model suitable for different circumferential and axial segmentation modes is proposed. The magnetic field, cogging torque, back-EMF, and electromagnetic torque are obtained by the proposed modeling. The accuracy of the analytical method is verified by 3D finite-element analysis. Finally, the modeling is used to analyze the variation of electromagnetic performance with different radial skew angle and axial segments. The proposed modeling can shorten the calculation time, and analyze the variation law of motor performance with PM segmentation and skew comprehensively. It provides a reference for the design and optimization of segmented PMSM with skewed poles and has great significance for improving motor performance.