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. 11, 1984
Filed:
Nov. 22, 1982
Applicant:
Inventor:
John G West, Pershore, GB;
Assignee:
Lucas Industries Limited Company, Birmingham, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310154 ; 310254 ; 335296 ;
Abstract
A permanent magnet dynamo electric machine is provided with a shield of high saturation flux density at the weaker or lower flux tip or edge of a permanent magnet pole face to prevent both circumferential and axial demagnetization of that portion of the pole face. The shield resides in a recess in the pole face so as to maintain a constant width air gap between the rotor and stator and has a thickness in the range of 5-15% of the overall thickness of the shield and pole combined. The shield and its pole face extend axially at least over the entire axial dimension of the area swept by the rotor.