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:
Apr. 03, 2018
Filed:
Apr. 22, 2013
Applicant:
Mitsubishi Electric Corporation, Tokyo, JP;
Inventors:
Hirohisa Yokota, Tokyo, JP;
Takuma Sasai, Tokyo, JP;
Moriyuki Hazeyama, Tokyo, JP;
Shinsuke Kayano, Tokyo, JP;
Assignee:
Mitsubishi Electric Corporation, Chiyoda-ku, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H02K 1/32 (2006.01); H02K 1/27 (2006.01);
U.S. Cl.
CPC ...
H02K 1/32 (2013.01); H02K 1/2766 (2013.01);
Abstract
According to an electric motor, a cooling hole is formed outside of a circular arc-like region having an intersection between extension lines from inner side surfaces of adjacent permanent magnets as a center of the circular arc-like region and a distance between the intersection and an intermediate point on the side surface of the permanent magnet as a radius of the circular arc-like region. Thus, heat generation by a magnetic resistance due to the cooling hole is suppressed to improve efficiency.