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:
Jun. 08, 2010
Filed:
Apr. 23, 2008
Takahiro Nakayama, Hamamatsu, JP;
Hirotaka Itoh, Kosai, JP;
Yoshiyuki Takabe, Hamamatsu, JP;
Keisuke Koide, Kosai, JP;
Yoshihito Nishikawa, Toyohashi, JP;
Takahiro Nakayama, Hamamatsu, JP;
Hirotaka Itoh, Kosai, JP;
Yoshiyuki Takabe, Hamamatsu, JP;
Keisuke Koide, Kosai, JP;
Yoshihito Nishikawa, Toyohashi, JP;
ASMO Co., Ltd., Shizuoka-Ken, JP;
Abstract
An embedded magnet type motor is disclosed. The rotor core of the motor has radially extending first accommodation holes and V-shaped accommodation holes. Each V-shaped accommodation hole includes a second accommodation hole and a third accommodation hole. A first gap is formed in each first accommodation hole. The first gap is not occupied by the corresponding first magnet. A second gap is formed in each second accommodation hole. The second gap is not occupied by the corresponding second magnet. A third gap is formed in each third accommodation hole at a radially outer portion. The third gap is not occupied by the corresponding third magnet. Each second gap and the adjacent third gap form one V-shaped gap. The angular width θa of each first gap and the angular width θb of each V-shaped gap are determined to satisfy the expression: 0.60<θa/θb<1.60.