Demagnetization sensing for permanent magnet synchronous motor drive
US11088643B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 2020 |
| Grant date | Aug 10, 2021 |
| Priority date | — |
| Expiry date | Mar 3, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor controller includes a current controller configured to generate control signals for driving a motor, where the current controller is configured to measure voltage information of the motor and current information of the motor; a flux estimator configured to calculate a rotor magnetic flux linkage based on the voltage and current information; an extraction circuit configured to extract a flux linkage magnitude of the rotor magnetic flux linkage from the received rotor magnetic flux linkage; and a demagnetization detector configured to continuously monitor for a demagnetization of a rotor permanent magnet of the motor during operation of the motor based on the flux linkage magnitude, where the demagnetization detector is configured to compare the flux linkage magnitude to a predefined demagnetization level and detect the demagnetization on a condition that the flux linkage magnitude is equal to or less than the predefined demagnetization level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.