Method for determining rotor position
US6208110A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1999 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Oct 1, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/70
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The absolute position of a rotor of a permanent magnet motor is determined by detecting an angular position of a direct axis of the rotor; and detecting a polarity of the rotor to determine the absolute position of the rotor. The polarity of the rotor may be determined by applying a square wave voltage to phase windings of a stator of the motor to generate an mmf vector parallel to the direct axis, measuring phase currents of the phase windings, determining a direct axis current responsive to the measured phase currents and the angular position, determining that the rotor is aligned with the mmf vector if the direct axis current is shifted positive, and determining that the rotor is aligned 180 degrees out of phase with the mmf vector if the direct axis current is shifted negative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.