Invention Grant
- Patent Title: Permanent magnet electric rotating machine and electromotive vehicle using permanent magnet electric rotating machine
- Patent Title (中): 永磁电动旋转机及电动车采用永磁电动旋转机
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Application No.: US12403244Application Date: 2009-03-12
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Publication No.: US07808144B2Publication Date: 2010-10-05
- Inventor: Fumio Tajima , Yutaka Matsunobu , Shouichi Kawamata , Suetaro Shibukawa , Osamu Koizumi , Keiji Oda
- Applicant: Fumio Tajima , Yutaka Matsunobu , Shouichi Kawamata , Suetaro Shibukawa , Osamu Koizumi , Keiji Oda
- Applicant Address: JP Tokyo JP Hitachinaka-shi
- Assignee: Hitachi, Ltd.,Hitachi Car Engineering Co., Ltd.
- Current Assignee: Hitachi, Ltd.,Hitachi Car Engineering Co., Ltd.
- Current Assignee Address: JP Tokyo JP Hitachinaka-shi
- Agency: Crowell & Moring LLP
- Priority: JP8-275826 19961018
- Main IPC: H02K1/27
- IPC: H02K1/27

Abstract:
A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.
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