Sensorless commutation position detection for brushless D.C. motors
US5990643A · kind A · utility
39Cited by
18References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1998 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Jul 24, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/182
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rotor position determination system for a polyphase D.C. brushless motor utilizing the back electromotive force (B.E.M.F.) voltage of the open or "off" phase of the motor as a critical signal for controlling the commutation of the motor, the system further including means for phase advance of the energization of the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.