Research on two manners of magnetization in surface-mounted permanent magnet machine

Two manners of magnetization in surface-mounted permanent magnet (SPM) machine have been investigated. The 2D finite element analysis model that is used to compute the field in this paper is first confirmed according to the parameters in a literature. Then the fields obtained from the accurate 2D finite element analysis model are compared, and the differences between the field of the machine with two magnetization manners in both inner rotor and outer rotor are illustrated. The rules of air-gap flux varied with the pole number and thickness of magnet are further analyzed with different magnetization in both inner rotor and outer rotor at last. The conclusions derived from the outer rotor SPM machine are also suitable for DC permanent machine. This paper helps us choose the right manner of magnetization to bring into full play of the potential of the magnet and improve the performance of the machine.