Method and device for detecting failure of excitation circuit of polyphase alternator
US8618829B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2007 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Apr 12, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/54
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The method of detecting the failure of the excitation circuit of a polyphase alternator controlled by a regulator comprises the following steps: a) electrical information (Iexc) is continuously taken from the excitation circuit (1); b) the electrical information taken in step a) is continuously compared with a predetermined threshold value (Iref); c) a logic state (LT) is continuously determined according to the result of the comparison made in step b); and d) if the logic state (LT) determined in step c) persists for a time at least equal to a predetermined delay time (6), an electrical continuity fault of said excitation circuit is signalled. This method is particularly suitable for machines having a rotor equipped with permanent magnets or having a high remanence of the magnetic circuit of the rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.