Method and apparatus for controlling the energization of an electric motor
US4378517A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1980 |
| Grant date | Mar 29, 1983 |
| Priority date | — |
| Expiry date | Jul 2, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/93
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
To control the energization of an electric motor pulses of current are supplied to the motor from a power source, and the pulse mark/space ratio and the motor field strength are controlled to determine the output speed and torque of the motor. Means are provided for deriving information representative of the speed of the motor and the torque required to be developed by the motor at that speed, and means are provided for determining information representative of the pulse mark/space ratio and the motor field strength necessary to provide the required torque at the said derived speed such that power losses are minimized. This makes it possible to control the motor field strength and mark/space ratio in accordance with the determined information to achieve optimum efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.