Brushless DC motor without a position sensor
US5130620A · kind A · utility
22Cited by
10References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1991 |
| Grant date | Jul 14, 1992 |
| Priority date | — |
| Expiry date | Jan 29, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/085
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A full wave drive brushless DC motor system detects zero-crossing points of counter electromotive forces respectively induced by the stator windings, and then pulse-shapes the thus detected zero-crossing points to obtain a pulse signal train, and then measures the thus obtained period of the pulse signal train to determine a conducting phase of the stator windings in response to the thus counted period. The system is thereby capable of supplying an electric current bidirectionally to each of the stator windings without using a position sensor for detecting a position of a rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.