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:
Aug. 27, 2002
Filed:
Feb. 27, 2001
Haruo Koharagi, Taga-gun, JP;
Masaharu Senoh, Narashino, JP;
Keiji Noma, Inba-gun, JP;
Kohei Ishii, Tokyo, JP;
Kazuo Sato, Sakura, JP;
Satoshi Kikuchi, Hitachi, JP;
Miyoshi Takahashi, Hitachi, JP;
Kouki Yamamoto, Hitachinaka, JP;
Tadashi Fukushima, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides a permanent magnet rotating electric machine that comprises a stator, into which concentrated wound armature windings are inserted in such a way as to surround a plurality of teeth formed in a stator core, and a rotor having rare earth permanent magnets inserted into a plurality of permanent magnet holes, which are formed in a rotor core and used for accommodating permanent magnets. In this permanent magnet rotating electric machine, the permanent magnets are each shaped like a convex “V” or “U” with respect to the shaft of the rotor. Moreover, a ratio of the width W of an interpole core between the permanent magnets to the width Xg of the gap between the stator core and the rotor core is set in such a manner as to satisfy the following condition: 0.8≦W /Xg≦13.2. Thus, even when this rotating electric machine is driven by a position sensorless inverter in the case of 120 degree energization, the system efficiency is enhanced.