open access

https://hdl.handle.net/2115/50823

A Ferrite PM In-Wheel Motor Without Rare Earth Materials for Electric City Commuters

英語

surface permanent magnet rotor structure

2012-11

IEEE

IEEE Transactions on Magnetics

48(11)

2961-2964

Electric city commuters are vehicles used for commuting from suburbs to inner cities and for movement within cities. Because of the short distances that they cover and their small battery size, such vehicles are beginning to attract attention. Generally, a high-performance permanent magnet (PM) composed of rare earth elements, such as neodymium and dysprosium, is used in the in-wheel PM synchronous motor (PMSM) of an electric city commuter. However, rising prices of rare earth elements and export restrictions on them are serious problems. Development of an in-wheel PMSM that does not utilize rare earth PMs is therefore highly desirable for electric city commuter vehicles. Accordingly, our research group has focused on a surface PM type axial gap structure that can achieve a high torque density and a short motor length in the axial direction. The designed motor structure with ferrite PMs replacing the rare earth PMs and the results of a three-dimensional finite element analysis are introduced in detail in this paper. Moreover, to examine the fundamental characteristics of the designed motor, a prototype is produced and tested.

学術雑誌論文

Accepted Manuscript

© 2012 IEEE. Reprinted, with permission, from Sone, K.; Takemoto, M.; Ogasawara, S.; Takezaki, K.; Akiyama, H., A Ferrite PM In-Wheel Motor Without Rare Earth Materials for Electric City Commuters, IEEE Transactions on Magnetics, Nov. 2012. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Hokkaido University products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

0018-9464