Method and apparatus for electronically commutating a direct current motor without position sensors
US4162435A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1976 |
| Grant date | Jul 24, 1979 |
| Priority date | — |
| Expiry date | Oct 5, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for electronically commutating a direct current motor is disclosed not requiring position sensors but rather sampling induced voltage across an unenergized motor winding to derive control signals therefrom. One motor winding is energized while the voltage across another winding is sampled and integrated to provide a flux indication. The integrated voltage sample is compared to a reference and when that integrated value exceeds the reference, the next winding of the motor is enabled and the voltage integral returned to an initial value. A ring counter maintains an indication of the currently energized winding and may also be employed to cause the sampling circuit to sample the induced voltage on the winding next in the motor sequence to be energized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.