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:
Mar. 05, 2013
Filed:
Feb. 25, 2009
Yasuyuki Saito, Hitachinaka, JP;
Tsuyoshi Goto, Hitachinaka, JP;
Noriaki Hino, Mito, JP;
Katsuhiro Hoshino, Hitachinaka, JP;
Yasuyuki Saito, Hitachinaka, JP;
Tsuyoshi Goto, Hitachinaka, JP;
Noriaki Hino, Mito, JP;
Katsuhiro Hoshino, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An electric rotating machine includes a stator, a rotor inserted in a bore of the stator such that an air gap is formed between the stator and the rotor, and a plurality of permanent magnets embedded in a peripheral portion of the rotor core of the rotor in a circumferential arrangement. Slits are formed in portions of the rotor core each extending between the adjacent magnetic poles. Compressive stress is induced in portions of the rotor core each extending between the slit and the permanent magnet when stress is induced in the portion of the stator core extending between the slit and the permanent magnet by centrifugal force produced when the rotor rotates and acting on the permanent magnet and a pole piece covering the permanent magnet.