Development of variable magnetic flux motor suitable for electric vehicle

Author

Zhou, G. ; Miyazaki, T. ; Kawamata, S. ; Kaneko, D. ; Hino, N.

Author_Institution

Adv. Res. Lab., Hitachi Ltd., Hatoyama, Japan

fYear

2010

fDate

21-24 June 2010

Firstpage

2171

Lastpage

2174

Abstract

Permanent magnet motors are widely used in electric vehicles (EVs) due to their high efficiency and small volume. However, the electric current that is applied to weaken the magnetic field has to be increased because the induced electromotive force is increased in proportion to the revolution speed. Therefore, the motor efficiency decrease at high revolution speeds. In this study, we developed a variable magnetic flux motor (VFM). That has a control method for mechanically weakening the magnetic field in order to improve the motor efficiency at high revolution speeds. Compared to a conventional motor, the VFM has a wider driving region. Additionally, its high efficiency region expands to the high revolution speed region. At a high revolution speed of 4500 min^-1, the prototype VFM can improve motor efficiency by 13%.

Keywords

electric vehicles; machine control; magnetic flux; permanent magnet motors; electric vehicle; high-revolution speed region; induced electromotive force; motor efficiency; permanent magnet motors; variable magnetic flux motor; Electric vehicles; Magnetic flux; Power electronics; Effective flux; Electric vehicle; High revolution speed; Motor efficiency;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Conference (IPEC), 2010 International

Conference_Location

Sapporo

Print_ISBN

978-1-4244-5394-8

Type

conf

DOI

10.1109/IPEC.2010.5542352

Filename

5542352