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:
Nov. 18, 2008
Filed:
Dec. 28, 2006
Satoshi Kikuchi, Hitachi, JP;
Haruo Koharagi, Hitachi, JP;
Akeshi Takahashi, Hitachi, JP;
Tomio Yoshikawa, Shizuoka, JP;
Baiying Huang, Shizuoka, JP;
Satoshi Kikuchi, Hitachi, JP;
Haruo Koharagi, Hitachi, JP;
Akeshi Takahashi, Hitachi, JP;
Tomio Yoshikawa, Shizuoka, JP;
Baiying Huang, Shizuoka, JP;
Hitachi Appliances, Inc., Tokyo, JP;
Abstract
A permanent magnet synchronous motor includes a rotor having cage windings and permanent magnets placed on an inner peripheral side of these cage winding bars, where the permanent magnets are placed and polarized so that a ratio θ/α between a circumferential pitch angle θ of magnetic flux distribution of the permanent magnets and a magnet pole pitch angle α is between 0.67 and 0.91.