Rate effect motor start circuit
US5589753A · kind A · utility
57Cited by
9References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1994 |
| Grant date | Dec 31, 1996 |
| Priority date | — |
| Expiry date | Apr 11, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/305
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A start circuit for a single phase AC induction motor employs a triac or similar device in series with the motor start or auxiliary winding. The triac device has associated circuitry so that it turns on in response to an increase in the time rate of change of applied voltage. In one version a PNP transistor and a capacitive timing circuit are employed to cut in the start winding. In another version a second, pilot triac is employed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.