Variable duty cycle pulse width modulated motor control system
US5017854A · kind A · utility
18Cited by
4References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1990 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | Oct 29, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B2203/0402
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control system for controlling a direct current powered motor in which the direct current voltage, which may not be constant, is reversibly commutated across the coil or winding of the motor during the predetermined commutation time intervals and chopped at high frequency during each commutation time interval by a variable duty cycle, pulse width modulated voltage, in which the width of each voltage pulse, determined by a reference voltage, is varied as an inverse function of the magnitude of the direct current voltage which exists during each voltage pulse interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.