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:
Mar. 03, 1998
Filed:
Apr. 24, 1997
David Mark Sugden, Ilkley, GB;
Switched Reluctance Drives, Ltd., Harrogate, GB;
Abstract
A failure detector for a position encoder which uses a plurality of position sensors. The failure detector receives position signals from the plurality of position sensors. The position signals represent the rotor position for a switched reluctance machine, and the position signals have allowable states and allowable output state sequences that occur if the position encoder is operating properly. If one or more of the plurality of sensors fail or the rotating element of the position encoder is damaged, an illegal state occurs in the position signals from the position sensors. The failure detector produces a failure signal upon the occurrence of an illegal state. In addition, the failure detector monitors the sequence of the output states and generates a failure when the output states change in a sequence that is not one of the allowed sequences. The machine controller can respond to the failure signal to stop machine operation or trigger an alternate positioning scheme.