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. 10, 2009
Filed:
Feb. 17, 2006
Akeshi Takahashi, Hitachi, JP;
Tomio Yoshikawa, Shizuoka, JP;
Baiying Huang, Shizuoka, JP;
Shigekazu Nozawa, Shizuoka, JP;
Susumu Nakayaka, Shizuoka, JP;
Haruo Koharagi, Hitachi, JP;
Satoshi Kikuchi, Hitachi, JP;
Akeshi Takahashi, Hitachi, JP;
Tomio Yoshikawa, Shizuoka, JP;
Baiying Huang, Shizuoka, JP;
Shigekazu Nozawa, Shizuoka, JP;
Susumu Nakayaka, Shizuoka, JP;
Haruo Koharagi, Hitachi, JP;
Satoshi Kikuchi, Hitachi, JP;
Hitachi Appliances, Inc., Tokyo, JP;
Abstract
The invention provides a motor comprising a stator and a rotor. The stator core includes a laminated stator core made of laminated stator core plates in which straight cut surfaces are formed on a circular outer peripheral surface of the laminated stator core plates. The straight cut surfaces of the laminated stator core plates are circumferentially displaced every predetermined laminated stator core plates so that the straight cut surfaces are uniformly distributed in an axial and a circumferential direction of the laminated stator core. Therefore, a flow passage for lubricating oil is ensured, while local magnetic saturation of the stator core is dissolved and a cogging torque and an induced voltage waveform distortion rate are improved.