关键词: Halbach永磁阵列, 电磁转矩, 有限元分析, Maxwell应力张量法

Abstract:

An improved Halbach permanent magnet array was introduced for Halbach permanent magnet arrays with single-sided magnetization, which improve the magnetic flux density of the air gap and improve the sinusoidal nature of the magnetic flux density waveform. The improved Halbach array is simple structure, easy magnetization, easy to optimize, further improved the sinusoidal of air gap flux density, increased the amplitude of fundamental wave of air gap magnetic flux density and the back-EMF amplitude, promoted permanent magnet motor efficiency, reduced torque ripples. The scalar magnetic field method was used to analyze the magnetic field generated by the modified Halbach permanent magnet array in the air gap of the motor. The expressions of air gap magnetic flux density and no-load back EMF were obtained. The Maxwell stress tensor method was used to analyze the electromagnetic torque. By designing an 8 kW motor model, the field finite element analysis was used to verify the accuracy and effectiveness of the introduced method.

Key words: Halbach permanent magnet array, electromagnetic torque, finite element analysis, Maxwell stress tensor method