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. 30, 2014
Filed:
Apr. 05, 2013
Applicants:
Cajetan Pinto, Mumbai, IN;
Pedro Rodriguez, Vasteras, SE;
Inventors:
Cajetan Pinto, Mumbai, IN;
Pedro Rodriguez, Vasteras, SE;
Assignee:
ABB Research Ltd., , CH;
Primary Examiner:
Int. Cl.
CPC ...
G01R 31/34 (2006.01);
U.S. Cl.
CPC ...
G01R 31/34 (2013.01); G01R 31/343 (2013.01);
Abstract
A missing stator slot wedge in an electrical machine can be detected by analyzing a current spectrum of the machine in a high frequency area. A current spectrum is provided from a current measurement, and values of the current spectrum in the high frequency area used to determine whether a stator slot wedge is missing or not. The conclusion can be based on values of a relative current amplitude Ior on presence of certain harmonics in the high frequency area.