Self-starting transducerless, brushless D.C. motor controller
US4455513A · kind A · utility
44Cited by
14References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1982 |
| Grant date | Jun 19, 1984 |
| Priority date | — |
| Expiry date | Jul 26, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/32
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A transducerless brushless permanent magnet motor in which a signal induced by the rotor in an unexcited winding is used to sense the rotor position. The sensed voltage, induced in the winding by the rotor, is integrated to provide a representation of the magnetic flux coupling the rotor and winding. Before start-up, both the rotor position and the integrator are initialized to align the circuit representation of the flux with the actual flux. In an additional embodiment of the invention, a self-initialization circuit is provided to automatically preset the rotor and flux integrator to pre-determined and corresponding values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.