Synchronous motor protection
US4683411A · kind A · utility
16Cited by
7References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1986 |
| Grant date | Jul 28, 1987 |
| Priority date | — |
| Expiry date | Sep 2, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P1/46
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A digital controller for synchronous motors prevents excessive heating of squirrel cage windings during motor starting. It reduces motor excitation if the actual accrued excitation time exceeds the maximum allowable excitation time of the controlled motor. It provides for adjustment of allowable time responsive to changes in excitation voltage. The thermal characteristic of the controlled motor is automatically derived from merely a few manually entered set point values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.