Method and apparatus for determining motor speed using zero crossing times
US5548197A · kind A · utility
30Cited by
12References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1994 |
| Grant date | Aug 20, 1996 |
| Priority date | — |
| Expiry date | Sep 28, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/48
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus to be used with a motor controller for determining the speed of the motor rotor using current zero crossing times of the stator winding currents. An error signal set, consisting of phase angle errors between consecutive zero crossings over a sampling period, is generated and analyzed in a region of interest in either the time or frequency domain, producing a signal frequency, the signal frequency being the frequency of the motor rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.