Novel permanent magnet motor with high reliability and high power density

Abstract

The invention discloses a novel permanent magnet motor with high reliability and high power density. A stator adopts a modular structure, an isolated strip-shaped structure is designed at the center of a groove to match a modular main stator core, and a winding adopts a fractional slot concentrated winding structure having a span of 1. A rotor can adopt a conventional surface patching structure, ahighly polymagnetic Hallbach permanent magnet array structure or a built-in permanent magnet structure. The novel permanent magnet motor has the advantages of greatly improving the winding process bymeans of the matching of the modular stator structure, the isolated strip-shaped structure and a cross section shape of a conducting wire, thereby improving the slot filling rate of the motor from the processing technology. In addition, through the thermal conduction and magnetic isolation functions of the isolated strip-shaped structure, the performance indexes such as the electromagnetic torqueand the amount of permanent magnets and the like of the motor are basically not affected while reducing the motor winding temperature and improving the interphase independence of the winding.

Description

technical field [0001] The invention relates to the aerospace field, in particular to a permanent magnet motor with high reliability and high power density. Background technique [0002] The permanent magnet motor has the characteristics of simple structure, small size and high efficiency, so it has good application scenarios in many occasions such as aerospace, all-electric aircraft and electric vehicles. At present, the research on permanent magnet motors mainly focuses on the improvement of power density. Many literature studies have shown that the improvement of power density needs to rely on higher electrical load and higher number of rotor poles, but this will make the motor stator iron loss, winding copper loss and rotor eddy current loss too large, which will bring extreme heat dissipation to the motor. big difficulty. The temperature in the motor will inevitably affect the magnetic properties of the permanent magnets. When the temperature is too high, the permanen...

AI Technical Summary

Problems solved by technology

However, the extra weight of the cooling system is difficult to meet the high power-to-weight ratio requirements in the fields of aerospace and all-electric aircraft

Images