关键词: 分段Halbach阵列, 磁极偏心, 极弧系数, 有限元分析

Abstract:

An optimized design of a surface mounted permanent magnet synchronous motor with an eccentric outer arc eccentric structure was presented. Each segmented pole has different center of arc inside and outside. The advantages of the new magnetic pole structure were verified by the finite element analysis. The magnetic flux density, cogging torque, and back electro motive force waveform of the motor under different eccentricity and pole arc coefficients were compared, the optimization of eccentricity and pole arc coefficient can effectively reduce the air gap flux density harmonic, reduce the back EMF harmonic and restrain the torque ripple. This structure can reduce the amount of permanent magnet material and improve the electromagnetic performance of the motor.

Key words: piecewise Halbach array, magnetic pole eccentricity, pole arc coefficient, finite element analysis