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:
Jul. 30, 2002
Filed:
Jun. 14, 2000
Applicant:
Inventor:
Claus Thybo, Sønderborg, DK;
Assignee:
Danfoss Drives A/S, Graatsen, DK;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 3/100 ;
U.S. Cl.
CPC ...
G01R 3/100 ;
Abstract
A method for monitoring a rotational angle sensor on an electrical machine. It is desired to provide a method that enables fault detection at both high speeds and low speeds of the rotor. The electrical power of the machine is measured and a power value is estimated using the output signal of the rotational angle sensor, a residual being formed from the measured power and the estimated power and the time curve of the residual being monitored.