Reduced voltage soft starter apparatus and methods using current-controlled transitions
US11128240B1 · kind B1 · utility
2Cited by
38References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2020 |
| Grant date | Sep 21, 2021 |
| Priority date | — |
| Expiry date | Aug 13, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P1/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor starter includes a plurality of semiconductor switches configured to couple respective phases of an AC power source to respective phases of a motor and a control circuit configured to configured to selectively operate the semiconductor switches to gradually increase a voltage applied to the motor, to determine root mean square (RMS) current values of a current of the motor as the voltage increases, and to cause the semiconductor switches to apply a full voltage or a more steeply ramping voltage to the motor responsive to the RMS current values meeting a criterion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.