2020 Volume 44 Issue 2 Pages 45-51
In this paper, we propose an interior permanent magnet synchronous motor (IPMSM) with an asymmetric magnetic pole structure that uses bonded neodymium magnets. By adopting the asymmetrical magnet arrangement, the current phase angle, where the magnetic torque is maximized, can be set to almost the same phase while maximizing the reluctance torque. To verify the usefulness of the proposed motor, we prototyped an actual motor on the basis of our proposed motor and compared the characteristics with a conventional IPMSM that uses sintered neodymium magnets. Although the torque of the proposed motor was smaller than the conventional motor due to a problem with the dimensions of the bonded neodymium magnets, it was shown that an IPMSM with an asymmetrical magnetic pole structure that uses Dy-free bonded neodymium magnets can achieve performance equivalent to conventional IPMSMs that use sintered neodymium magnets.
