The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 2009
Filed:
Feb. 03, 2005
Kenji Fujiwara, Hyogo, JP;
Takatoshi Kogure, Hyogo, JP;
Akira Nishio, Hyogo, JP;
Tutomu Baba, Hyogo, JP;
Kenji Fujiwara, Hyogo, JP;
Takatoshi Kogure, Hyogo, JP;
Akira Nishio, Hyogo, JP;
Tutomu Baba, Hyogo, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
The present invention provides a technique for enabling permanent magnets constituting the field magnet system of an IPM electric rotating machine to be embedded in a rotor core in a shallower depth. The IPM electric rotating machine is composed of a stator and a rotor. The rotor includes a rotor core and permanent magnets constituting the field magnet system. The rotor core has a side face opposed to the stator, and the permanent magnets are shallowly embedded so that the distance between the pole face thereof and the rotor side face is reduced. Furthermore, two adjacent permanent magnets are intensively spaced so that the following formula holds:0.3<()/,where Lis the q-axis inductance of the rotor, and Lis the d-axis inductance thereof.