Collectorless direct current motor, driver circuit for a drive and method of operating a collectorless direct current motor
US4804892A · kind A · utility
33Cited by
12References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1987 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Jun 22, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for the low-loss regulation of a collectorless direct current motor and a semiconductor circuit has, during the commutation phase given by a position sensor and with reduced motor output and number of revolutions, transistors or one end transistor which initially operates temporarily as a switch and thereafter operates temporarily as an analog amplifier element. During the analog period, a current is available which changes slowly according to a ramp function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.