Method of determining the rotor position of a permanent-magnet motor
US9088238B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 2013 |
| Grant date | Jul 21, 2015 |
| Priority date | — |
| Expiry date | Jan 14, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of determining the position of a rotor of a permanent-magnet motor. The method uses two different schemes to determine the position of the rotor. A first scheme is used when the rotor rotates within a first speed range, by sequentially exciting and freewheeling a winding of the motor, measuring a parameter that depends on the rate of change of current in the winding, and comparing the parameter against a threshold. A second scheme is used when the rotor rotates within a second speed range, by generating a voltage signal that is proportional to the voltage across the winding, generating a further voltage signal that depends on the rate of change of current in the winding, and comparing the two signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.