Control of a brushless motor
US8933654B2 · kind B2 · utility
17Cited by
87References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2011 |
| Grant date | Jan 13, 2015 |
| Priority date | — |
| Expiry date | Sep 13, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2209/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of controlling a brushless motor that includes rectifying an alternating voltage to provide a rectified voltage, exciting a winding of the motor with the rectified voltage and freewheeling the winding when current in the winding exceeds a threshold. The winding is freewheeled for a freewheel period, which is updated in response to a zero-crossing in the alternating voltage. Additionally, a control system that implements the method, and a motor system that incorporates the control system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.