Control system for a brushless motor
US4051417A · kind A · utility
14Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1975 |
| Grant date | Sep 27, 1977 |
| Priority date | — |
| Expiry date | Sep 4, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/085
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a control system for a brushless motor comprising a power source, a plurality of driving coils and contactless switching elements for intermittently supplying voltage across the power source to the driving coils in response to rotor position signals, rotor position signals are chopped by a chopping signal in which a ratio of a high level period to a low level period can be changed, and a portion of the contactless switching elements is driven by the chopped rotor position signals, thereby controlling the rotating speed of the brushless motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.