Self-starting brushless DC motor
US4484114A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 1982 |
| Grant date | Nov 20, 1984 |
| Priority date | — |
| Expiry date | Mar 4, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A self-starting DC motor includes first and second main windings and a rotor. A starting winding is angularly offset from the first and second main windings for aligning the rotor offset from the main windings to start the motor from a noncogged position. A timing device is employed to energize the angularly offset windings when the motor is first turned on. After a time sufficient for the rotor to come to rest in its starting position, the starting winding is deenergized. A position sensing device generates signals indicative of the position of the rotor. A switch is responsive to the position indicating signals and alternately energizes the first and second main windings to operate the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.