The Design of Permanent Magnet Machine With Segmented Poles Based on Nanocomposite Magnets

The development of rare earth permanent magnets has greatly enhanced the performance of permanent magnet synchronous motors in recent years. However, high-performance rare-earth PMs face challenges related to non-renewable resources and supply chain risks. Meanwhile, partial demagnetization of rare earth permanent magnets is a key issue in motor design. The aim of this paper is to optimize multilayer nanocomposite magnets and combine them with electric motors according to the needs of motor development. The properties of nanocomposite magnets with less rare earth and high theoretical magnetic energy product are analyzed by micromagnetism. The effects of soft magnetic layer thickness, hard magnetic layer orientation and temperature on the performance of nanocomposite magnets are analyzed. The microstructure design of nanocomposite magnets was carried out according to the demand of permanent magnets for motor design. The IPM machine with segmented magnetic poles is proposed. The results of the demagnetization simulation show that the no-load back electromotive force drop of this motor is reduced compared with the traditional rare earth permanent magnet synchronous motor. The anti-demagnetization reliability of the motor is improved.