Sensorless brushless DC motor
US5886486A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1998 |
| Grant date | Mar 23, 1999 |
| Priority date | — |
| Expiry date | Feb 5, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/15
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control circuit and method for controlling a sensorless brushless DC motor are provided which are capable of effectively filtering noise. The control circuit includes: a phase voltage measuring unit for determining the voltage of each phase from the terminal voltages of the stator coils; a phase voltage sign detecting unit for detecting the sign of the phase voltage measured from the phase voltage measuring unit and outputting a phase voltage sign signal; and a digital phase-shifter for generating a delay signal which is delayed up to 90.degree. with respect to the phase voltage sign signal and supplying the delayed signal to the commutation unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.