Study on the Improvement of the Correction Coefficient Considering the 3-D Effect of Spoke-Type Permanent-Magnet Synchronous Motor

Abstract

In this article, a correction coefficient is proposed to reduce the error between 2-D finite-element analysis (FEA) and 3-D FEA results. The 2-D FEA results of flux-concentrating machines, such as a spoke-type permanent-magnet synchronous motor (PMSM), show considerable error compared to 3-D FEA results because of 3-D effects. Therefore, 3-D FEA is required to predict the performances precisely for this kind of machine, but it is a time-consuming task. This article proposes the correction coefficient to get accurate results with 2-D FEA. Compared to previous studies, the proposed coefficient can consider the effect of both axial linkage flux and axial leakage flux. Furthermore, the proposed general-purpose correction coefficient could be easily applied to any complex-shaped spoke-type PMSM without complex mathematical calculations. In order to verify the proposed correction coefficient, 2-D and 3-D FEA were performed on various models. Finally, the validity was finally verified through comparison with actual experimental results for prototypes with particular specifications. © 2020 IEEE.