Energy saving motor speed controller
US4443750A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1980 |
| Grant date | Apr 17, 1984 |
| Priority date | — |
| Expiry date | Apr 30, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P27/047
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A variable speed motor controller for an AC motor, said controller including a DC to AC converter for providing adjustable frequency AC signals to vary the speed of said motor, and a sensing device and energy saving control for detecting the magnitude of the current signal being supplied to the motor and adjusting the AC voltage to the motor depending upon the magnitude of the current signal. The smaller the motor current being sensed, the smaller the voltage applied to the motor, thereby effecting a saving of energy. Energy is saved using this controller because when the lesser motor current indicates that it is driving less than full load, the input voltage applied to the motor is reduced thereby effecting a power saving.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.