Rotational speed control device for an electric motor
US6243532A · kind A · utility
9Cited by
2References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1997 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Jun 6, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/904
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A speed control device for an electric motor fed by a direct voltage source, the device comprising a controlled switch by which the motor voltage is alternately switched on and off under the control of a modulated switching pulse sequence. The switching frequency is higher than the frequency corresponding to the time constant of the electric motor. The switched motor voltage is regulated to a voltage set value corresponding to a desired motor speed by influencing the modulated switching pulse sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.