Reduced ripple drive circuit for a brushless motor
US4658190A · kind A · utility
26Cited by
1References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1984 |
| Grant date | Apr 14, 1987 |
| Priority date | — |
| Expiry date | Oct 26, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive circuit for a three-phase brushless motor in which two Hall detectors are spaced 120.degree. apart in electrical angle near the rotors to detect magnetic flux signals for two phases. Their outputs are summed and inverted to form the third phase signal. The three phase signals drive the respective coils on the stator. The three phase signals are also separately squared and then added to adjust, in a feedback fashion, the current through the Hall detectors, whereby torque ripple is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.