NDLI: Characteristics of a Permanent-Magnet Synchronous Motor with a Dual-Molding Permanent-Magnet Rotor

Content Provider	IEEE Xplore Digital Library
Author	Amano, H. Enomoto, Y. Ito, M. Masaki, R. Masuzawa, M. Mita, M.
Copyright Year	2007
Description	Author affiliation: Hitachi Res. Lab., Hitachi, Ltd., Hitachi (Amano, H.; Enomoto, Y.; Ito, M.)
Abstract	A dual-molding magnet rotor was evaluated as a soft magnetic composite for the magnetic material of the rotor of a motor. Especially the possibility of using a dual-molding magnet rotor as means to improve motor efficiency was investigated. A dual-molding magnet rotor was a one-piece permanent magnet rotor made with bonded NdFeB magnet and soft magnetic composite core. A permanent-magnet synchronous motor was targeted for evaluation, and three types of dual-molding magnet rotors with different magnetic orientations were evaluated using the finite element method (FEM) and a trial model of test motor. It was confirmed that the cogging torque originated in the variation of the rotor element decreased because the pole-pitch accuracy and the outer-size accuracy were improved by utilizing a one-piece molding in the dual-molding magnet rotor. In spite a difference in the maximum energy products of the three magnets of about three times, the difference between maximum efficiency of the sintered rare-earth radial ring magnet and the isotropic-multi-pole oriented magnet and that between the former and the anisotropic-pole-concentrate oriented magnet are within 1%. The evaluation results show that the structure of dual-molding-magnet-rotor is superior to sintered rare-earth radial ring magnet rotor.
Starting Page	1
Ending Page	7
File Size	942767
Page Count	7
File Format	PDF
ISBN	142441296X
ISSN	19325517
DOI	10.1109/PES.2007.385435
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Synchronous motors Rotors Magnetic anisotropy Perpendicular magnetic anisotropy Soft magnetic materials Permanent magnet motors Magnetic materials Permanent magnets Bonding Magnetic cores permanent-magnet motor bonded magnet soft magnetic composite magnetic characteristics
Content Type	Text
Resource Type	Article

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