Feedback circuit for eliminating DC offset in drive current of an AC motor
US5053688A · kind A · utility
19Cited by
16References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 15, 1990 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Aug 15, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/4803
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor control (10) for a motor (12) powered by an AC pulse source which applies current pulses to stator windings of the motor to cause rotation of the motor in accordance with the invention includes a current sensor (18) for sensing a DC net current in the current pulses flowing to the stator windings; a pulse width modulator (26-58) for pulse width modulating the current pulses; and wherein the width of the pulses is modulated in response to the sensed net current to reduce the net current towards zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.