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:
Oct. 18, 2011
Filed:
Feb. 18, 2009
Akinori Kamiya, Hitachi, JP;
Noriaki Hino, Mito, JP;
Fumio Tajima, Hitachi, JP;
Tsutomu Miyoshi, Chiba, JP;
Hideki Nihei, Hitachiota, JP;
Akinori Kamiya, Hitachi, JP;
Noriaki Hino, Mito, JP;
Fumio Tajima, Hitachi, JP;
Tsutomu Miyoshi, Chiba, JP;
Hideki Nihei, Hitachiota, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention comprises a stator, and a rotor which is disposed oppositely to the stator with a gap interposed. The stator comprises a stator core, and a distributed stator winding mounted to the stator core. The stator core comprises a ring-like yoke core, and a plurality of teeth cores which protrude from the yoke core in the radial direction. The rotor comprises a rotor core, and a plurality of permanent magnets embedded in the rotor core. A pair of non-magnetic portions is created inside the rotor core and on both sides of the circumferential width of a permanent magnet for one magnetic pole. In the rotor core located on the stator side of the pair of non-magnetic portions, a pair of magnetic paths is created as the result of the creation of the pair of non-magnetic portions. Furthermore, a groove or hole is created on the outer circumferential portion of the rotor core and between the adjacent magnetic poles.