Method for detecting a fault condition
US8058894B2 · kind B2 · utility
5Cited by
2References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 2009 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Feb 25, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/38
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for detecting and correcting for a step loss condition. A back electromagnetic force signal is measured and compared to a reference voltage. The motor continues operating and the back electromagnetic force signal is measured again and compared to the reference voltage. If the measured levels of the back emf voltages are less than the reference voltage, a step loss condition has occurred and the stator field is repositioned.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.