Control system for brushless DC motor
US4712050A · kind A · utility
101Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1987 |
| Grant date | Dec 8, 1987 |
| Priority date | — |
| Expiry date | Jan 30, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/085
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control system for brushless DC motors detects counter electromotive force voltages induced in motor windings and produces rotor position detection signals from the counter electromotive force voltages. The maximum value of an input DC current to a motor drive circuit is held and the phase of the rotor position detection signals is changed in accordance with the held value of the input DC current to prevent the phase of the position detection signals from varying with the load on the brushless DC motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.