Method and circuit arrangement for determining the rotor position of an EC motor in the standstill state
US7893649B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 2006 |
| Grant date | Feb 22, 2011 |
| Priority date | — |
| Expiry date | Jan 4, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/085
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and circuit arrangement for determining position of the rotor of an electronically commutated motor, wherein the rotor has magnetic axes having different permeances. Voltage is applied to stator phases, and resultant phase currents are monitored for purpose of determining rotor position in the standstill state of the motor. First and second rise times of phase currents are determined until predetermined limit values are reached in unsaturated state. The assignment of a magnetic axis to a stator phase is determined from first rise times of the currents in unsaturated state of the rotor core, and the polarization of the rotor is determined from second rise times of currents upon energization with saturation effects. After run-up of the motor, initial energization of the stator can be determined comparing levels of the magnet wheel voltages and corrected by changing the commutation of stator energization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.