Motor driving system for driving brushless motor
US5969489A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1997 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Jul 29, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P2209/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor driving system for a brushless motor is comprised of a drive magnet, a rotor provided with the drive magnet and supported by the shaft, 3-phase stator coils provided on a substrate and facing to the drive magnet, two Hall elements exposed to magnetic fluxes of the drive magnet and outputting Hall signals having a 120 degrees phase difference, an amplitude control device for equalizing an amplitude difference between the Hall signals and outputting equalized Hall signals, a signal compounding device for compounding the equalized Hall signals and outputting a compound signal, a drive circuit for switching drive currents to be supplied to the 3-phase stator coils in response to the equalized Hall signals and the compound signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.