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:
Sep. 13, 2005
Filed:
Feb. 12, 2004
Applicants:
Yuji Enomoto, Hitachi, JP;
Osamu Sekiguchi, Ryugasaki, JP;
Hitoshi Ishii, Aioi, JP;
Katsuo Kawashima, Aioi, JP;
Inventors:
Yuji Enomoto, Hitachi, JP;
Osamu Sekiguchi, Ryugasaki, JP;
Hitoshi Ishii, Aioi, JP;
Katsuo Kawashima, Aioi, JP;
Assignee:
Japan Servo Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02K021/12 ; H02K001/18 ;
U.S. Cl.
CPC ...
Abstract
A permanent magnet motor for driving a fan is rotated while a movement of the rotor in a direction of thrust of a rotary shaft with a rotation of the fan is prevented by magnetic attraction force of a permanent magnet and a stator core. A surface magnetic flux density of the permanent magnet facing the stator core is lower at an end portion than at a central portion of the permanent magnet in the direction of thrust of the rotary shaft.