Electric motor starting circuit
US5969497A · kind A · utility
14Cited by
5References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1998 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Nov 25, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P1/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric induction motor can be given a kick start without excessive current drain on the supply by first connecting a unidirectional supply to a winding of the motor to build up a stationary rotor flux and then applying a starting current to another winding of the motor to produce a stator flux at an appropriate angle (between 0.degree. and 180.degree.) with the stationary rotor flux. Once the motor has begun accelerating the normal running supply can be connected. This starting current may be derived from a capacitance which is charged up during the period of establishing the stationary rotor flux.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.