Self-synchronizing AC synchronous driver for DC brushless motors
US6570360B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2000 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | Jun 30, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/182
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and system for driving a phase of an electrical motor are disclosed. The method and system detect the back electromotive force being generated by a coil. The back electromotive force is amplified or attenuated to a level necessary to drive the motor at a desired speed and is fed back into the coil. The detected back electromotive force signal that drives the motor is proportional to, in phase with, and at the same frequency as the back electromotive force signal being generated by the coil. Using the back electromotive force to produce the drive signal permits autosynchronization of the drive signal without use of position sensors and reduces acoustic noise and velocity modulation associated with sudden torque shifts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.