Method of diagnosing a fault in a motor circuit
US11201579B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 2020 |
| Grant date | Dec 14, 2021 |
| Priority date | — |
| Expiry date | Aug 5, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of diagnosing an open phase fault condition comprising the steps of: determining the q axis motor current in the motor, the motor speed, the q axis motor current demand, and the demanded phase voltage from the controller and outputting a signal indicative of that an open phase fault condition of motor is present when the following conditions are met: (1) the q axis current demand amplitude is above a threshold; (2) the q axis motor current is below a first predefined fraction of the demanded q axis motor current; (3) the demanded phase voltage is greater than a second predefined fraction of the saturated phase voltage value of the motor circuit; and (4) the motor speed is below a threshold speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.