Bifilar brushless DC motor
US4275339A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1979 |
| Grant date | Jun 23, 1981 |
| Priority date | — |
| Expiry date | Dec 21, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K3/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A brushless D. C. motor is disclosed having two bifilar winding wire pairs with each bifilar pair forming alternate windings. Each winding is switched by a transistor which has a back poled diode connected in parallel therewith. The control circuit sequences energization of single windings with each winding energized being in a different bifilar pair than the next preceding energized winding whereby when a transistor is switched off the other winding of the bifilar pair and the associated back poled diode protect the transistor and provide an energy conserving/heat eliminating path for the induced current. Each winding is further formed of a pair of subwindings having an angle of separation therebetween approximately half the angular separation between adjacent windings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.