Detection of instantaneous position of the rotor of a brushless DC motor driven in a tripolar mode
US5969491A · kind A · utility
36Cited by
2References
52Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1998 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Jul 14, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/182
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The sensing of the rotor position for synchronizing the drive of a multi-phase brushless motor when driven in a "multi-polar" mode is carried out by interrupting the driving current in at least one of the windings of the motor coupled with a zero-cross sensing circuit of the BEMF signal. This done by using a first logic signal, enabling a logic gate for asserting a zero-cross event detected by the circuit by a third logic signal, and simultaneously resetting the first signal and the third signal after a certain period of time from the instant of interruption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.