关键词: 偏心, 交替极永磁电机, 子域模型, 磁场, 保角变换

Abstract: To realize a fast prediction of the open-circuit magnetic field of a consequent-pole permanent magnet motor under rotor eccentricity, a two-dimensional analytical model is established in this paper. Based on the theory of the subdomain method,the solution region is divided into a permanent magnet subdomain and an air-gap subdomain, and the corresponding Laplace equations are established in each subdomain. According to the boundary conditions of the subdomain model,the concentric magnetic field is derived by using the magnetic vector potential. The conformal mapping is introduced to transform the eccentric circular domain into an equivalent concentric one,and a relative permeance function is constructed to correct the concentric solution,so that the magnetic field under eccentricity can be determined. The analytical results are compared with the finite element simulation results,and the accuracy of the analytical analysis verifies the reasonableness of the proposed method.

Key words: eccentricity, consequent-pole permanent magnet motor, subdomain model, magnetic field, conformal mapping