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:
Oct. 16, 2012
Filed:
Jul. 17, 2009
Rui Feng Qin, Hong Kong, CN;
James Ching Sik Lau, Hong Kong, CN;
Yong Bin LI, Shenzhen, CN;
Cheng Shun Du, Shenzhen, CN;
Yuan Jiang, Shenzhen, CN;
Rui Feng Qin, Hong Kong, CN;
James Ching Sik Lau, Hong Kong, CN;
Yong Bin Li, Shenzhen, CN;
Cheng Shun Du, Shenzhen, CN;
Yuan Jiang, Shenzhen, CN;
Johnson Electric S.A., La Chaux-de-Fonds, CH;
Abstract
An electric motor has a housing, a rotor rotatably installed in the housing, n permanent magnets with the same polarity fixed at an inner surface of the housing. The rotor is a wound armature having a plurality of teeth extending in a radial direction. The housing includes n inner projecting parts, the permanent magnets and the inner projecting parts being alternately arranged in a circumferential direction about the rotor. The magnets generate 2n magnetic circuits via the housing and the rotor, n being an integer greater than one. The size of at least a portion of a first air gap formed between the permanent magnets and the rotor is greater than the size of at least a portion of a second air gap formed between the inner projecting parts and the rotor.