高温高速永磁电机关键技术研究综述

This paper presents a systematic analysis of the structure and design characteristics of motors and comprehensively introduces the technical issues related to the comprehensive design of the high-speed permanent magnet motor system in a high-temperature environment. Considering the change of physical and electrical properties of motor materials under high temperature, the relationship between the electrical steel and permanent magnet materials, and temperature is tested and analyzed. This reveals that the magnetic conductivity and core loss of electrical steel decrease gradually with the increase of temperature. Based on the type and temperature resistance grade of the insulating material and lubrication system, the characteristics of stator and rotor topology types under different temperatures are compared and analyzed. This paper also proposes a claw-pole stator topology for a wide temperature range, a low-harmonic multi-layer unequal-turn winding topology, and an integrated self-cooling composite rotor structure. Key issues concerning the following aspects are summarized: rotor support technology of high-speed permanent magnet motors, calculation of mechanical characteristics, dynamics analysis, and improvement of dynamicity and anti-disturbance of driving control technology. Finally, we forecast the future development trends and hot spots of high-temperature and high-speed permanent magnet motors regarding high-performance magnetic materials, new processes, new topological structure design, and other aspects.