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. 23, 2004
Filed:
Sep. 17, 2002
Shoji Ohiwa, Gunma, JP;
Kazuo Ohnishi, Gunma, JP;
Yoichi Nagata, Gunma, JP;
Junichi Ikeda, Gunma, JP;
Tomokazu Uchiyama, Gunma, JP;
Kouji Yoneda, Gunma, JP;
Hideo Saito, Gunma, JP;
Masahiro Mimura, Ibaragi, JP;
Japan Servo Co., Ltd., Tokyo, JP;
Abstract
A brushless DC motor wherein a rotor has a motor shaft, a rotor yoke mounted on the motor shaft, and a ring-shaped magnet magnetized so as to have a plurality of magnet poles in the circumferential direction thereof, and held by the rotor yoke. A stator has first and second stator yokes each having main magnetic poles extending in the radial direction from the center thereof, magnetic pole pieces extending in the vertical direction from tip ends of the main magnetic poles along an inner peripheral surface of the ring-shaped magnet, a center yoke surrounding the motor shaft for connecting magnetically said first and second stator yokes, a winding assembly having an annular winding, and a printed wiring board, on which the annular winding, a electromagnetic conversion element and a driving circuit are mounted.