Permanent magnet e.g. ring/disk-shaped permanent magnet, magnetizing method for rapidly-rotating electric motor, involves changing condition of magnetic material relative to magnetization device during each magnetization process

摘要

The method involves impressing a set of magnetic poles e.g. north and south poles (38, 40), in ring or disk-shaped magnetic material (36) of a permanent magnet by using a magnetization device. The poles are arranged and distributed alternate to a periphery of the magnetic material to form sector zones with angle of 360 degrees. Magnetization is accomplished in two magnetization processes, where condition of the magnetic material is changed relative to the magnetization device during each magnetization process.