关键词: 永磁电动机, 齿槽转矩, 分数槽集中绕组, 齿靴, Maxwell 2D, 有限元分析

Abstract: The existence of stator boot of external rotor permanent magnet motor reduces the winding efficiency and slot filling rate. Taking external rotor permanent magnet motor with 12-slot and 14-pole fractional slot centralized winding as an example, a transient magnetic field simulation model based on Maxwell 2D was established to study the effects of magnetic pole parameters and stator boot width on magnetic field distribution, winding potential and slot torque. Aiming at maximum electromotive force and minimum cogging torque, a permanent magnet motor with external rotor without toothed boots was designed. The prototype is proved to be correct.

Key words: permanent magnet motor, cogging torque, fractional-slot concentrated winding, tooth boots, Maxwell 2D, finite element analysis