Method and apparatus for evaluation of insulation in variable speed motors
US6573727B2 · kind B2 · utility
4Cited by
7References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2001 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Jan 25, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/343
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A signal obtained from the drive input of a motor or an insulated winding is applied to a sensor that strongly rejects high frequency drive signal components yet passes discharge signal components. This allows discharge signal components to be detected in the presence of harmonics of the drive signal. The voltage of the drive signal may be varied so that the lowest drive signal voltage producing a discharge event may be determined. That voltage is the motor or winding's corona inception voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.