关键词: 外转子近极槽永磁电机, 齿顶漏磁, 齿槽转矩, 磁钢削极

Abstract: The outer rotor near pole slot permanent magnet motor can output higher torque under limited size, but the closer gap of the pole slot will cause tooth tip leakage of the magnetic circuit, resulting in a decrease in motor torque performance. The torque performance optimization method of the near pole slot motor with outer rotor was studied. From the rotor shape, the influences of arc coefficient, direction of magnetization and sinusoidal cutting on magnetic leakage and slot torque were analyzed, the relationship between arc cutting length and fixed edge thickness was derived. The influence of electrode filling shape on magnetic flux leakage and torque of the motor was analyzed, the magnetic flux leakage coefficient under different filling thickness was calculated, and the eddy current loss of magnetic steel was reduced by changing the notch circle radius and permanent magnet segment. After optimization, the motor tooth groove torque was reduced by 1. 1 N · m, the air gap magnetic density THD was reduced by 11. 1 % , the eddy current loss of permanent magnet was reduced by 10. 9 W when the output torque was the same, which provides a reference for the field of aeronautical engineering power.

Key words: outer rotor near pole slot permanent magnet motor, tooth tip leakage, groove torque, pole cutting of magnetic steel