电推进用48槽44极永磁容错电机低谐波分析与设计

Low Harmonic Analysis and Design of 48-Slot 44-Pole Permanent Magnet Fault Tolerant Motor for Electric Propulsion

分数槽集中绕组永磁电机由于具有高相间独立性的优点,非常适用于电推进系统。但是,其磁动势谐波大的弊端会严重影响电推进系统的性能。因此,进行永磁电机的低谐波设计,避免谐波引起过高的涡流损耗及振动噪声,具有十分重要的现实意义。文章分析了48槽44极永磁电机的磁动势谐波含量,通过有限元仿真验证多层绕组、定子不等齿宽、多层绕组相移、添加定子磁障等方法对绕组磁动势谐波的影响。实验表明,这些方法可以有效降低绕组磁动势的谐波含量。

Fractional slot concentrated winding permanent magnet motor is very suitable for electric propulsion system because of its advantage of high phase independence.However,the disadvantage of large magnetomotive force harmonic will seriously affect the performance of electric propulsion system.Therefore,carrying on the low harmonic design of permanent magnet motor to avoid excessive eddy current loss and vibration noise caused by harmonic is of great practical significance.This paper analyzes the magnetomotive force harmonic content of 48-slot 44-pole permanent magnet motor.The influence of multi-layer winding,unequal tooth width of stator,phase shift of multi-layer winding and adding stator magnetic barrier on the winding magnetomotive force harmonic is verified by finite element simulation.Experiments show that these methods can effectively reduce the harmonic content of winding magnetomotive force.