Permanent split-phase capacitor induction motor
US4672284A · kind A · utility
10Cited by
6References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 8, 1985 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Oct 8, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P1/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent split-phase capacitor induction motor having a capacitor (7) connected in series with an auxiliary winding (5) via an electronic switch (9) which is operated by a control circuit (11, 13) so as to obtain a higher starting torque than if the switch were permanently closed. The control circuit suitably comprises an integrating (21 to 31) responsive to the voltage appearing across the switch (9) and trigger circuit (19) which closes the switch when the output of the integrating circuit exceeds a threshold value, the integrating circuit resetting when the switch closes, and the switch reopening at the next current zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.