Power factor controller
US4388578A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1980 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | Jul 7, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E40/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power factor controller for an AC induction motor which controls the input power to the motor commensurate with the loading on the motor so as to improve efficiency. The circuit provides a signal representative of the phase difference between the current through the motor and the voltage across it. The phase difference varies with motor loading and accordingly is utilized to control the input power to the motor. The improvement in efficiency is displayed in terms of the percent savings provided by the controller. The circuit provides an immediate response to initial energization of the motor to enable the motor to reach full speed in minimum time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.