Permanent magnet stepping motor having pole teeth misaligned by an electrical angle

摘要

The stator assembly of a PM stepping motor having a two-phase structure in which two stators arranged along the circumferential direction in such a manner that respective pole teeth are intermeshed together are combined back to back so as to phase-shift the respective pole teeth in the two stators at an electrical angle of 90°. The field rotor magnet is so arranged as to face the respective pole teeth at a small distance, and is magnetized on its circumferential surface along the circumferential direction with a plurality of alternating N- and S-poles having a preset width not matching the pole tooth pitch of each stator.