Synchronous motor protection
US4641074A · kind A · utility
4Cited by
7References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1984 |
| Grant date | Feb 3, 1987 |
| Priority date | — |
| Expiry date | Sep 21, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/0805
- 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.