Energizing circuit for providing low voltage starting for submersible pump motor
US4330740A · kind A · utility
13Cited by
6References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1979 |
| Grant date | May 18, 1982 |
| Priority date | — |
| Expiry date | Sep 28, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P1/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Low voltage starting of a three-phase submersible pump motor in a shallow well is achieved by employing a high-impedance transformer for supplying the three-phase power to the motor. Upon starting, the normally heavy current drawn by the motor results in a voltage drop through the high-impedance transformer sufficient to substantially lower the voltage across the motor and hence the starting current. In the absence of limiting the starting current, abnormally high starting torques will be produced on the motor shaft resulting in mechanical fatigue and eventually shaft breakage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.