Dynamic braking of A.C. motors
US4311948A · kind A · utility
13Cited by
4References
56Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1979 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | Apr 2, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P3/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A three-phase electric motor is partially braked as a result of self-excitation when the power supply is disconnected and a capacitor is connected across one of the windings. The motor is then rapidly brought to a standstill by applying a short-circuit (or connecting a relatively low impedance) across one or both of the other windings, and essential condition being that the short-circuit is initiated within a predetermined range of values of phase angle in a waveform of the self-excitation. Preferred ranges of phase angle are established for selected configurations of mechanical and electronic short-circuiting switches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.