Method and apparatus for driving a brushless motor
US4922169A · kind A · utility
85Cited by
19References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1988 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Oct 4, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An n-phase, m-pole (wherein n and m are integers) brushless motor is driven without use of physical rotary position detectors, such as Hall elements or the like. An harmonic component of back emf induced in the phases of the motor is detected and used to generate phase energizing signals (such as in response to zero crossings of the detected harmonic component) which, in turn, energize selected phases of the motor. Drive current is supplied to those phases which are energized by the phase energizing signal in predetermined sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.