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. 08, 2015
Filed:
Jan. 27, 2012
Applicants:
James Ching Sik Lau, Hong Kong, CN;
Chun Kit Cheung, Hong Kong, CN;
Duncan Yiu Lung Wong, Hong Kong, CN;
Inventors:
James Ching Sik Lau, Hong Kong, CN;
Chun Kit Cheung, Hong Kong, CN;
Duncan Yiu Lung Wong, Hong Kong, CN;
Assignee:
JOHNSON ELECTRIC S.A., Murten, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K 21/26 (2006.01); H02K 11/02 (2006.01); H02K 23/04 (2006.01); B25F 5/00 (2006.01);
U.S. Cl.
CPC ...
H02K 23/04 (2013.01); B25F 5/00 (2013.01); H02K 11/026 (2013.01); H02K 2213/03 (2013.01);
Abstract
An electric motor includes a stator and a rotor rotatably installed in the stator. The stator has a housing and a plurality of permanent magnets. The outer diameter of the housing is less than 40 mm and the ratio of the maximum thickness of the magnets in the radial direction of the rotor to the diameter of the rotor is in the range of 1:7 to 1:50.