Electric motor fault detection
US12224692B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 28, 2022 |
| Grant date | Feb 11, 2025 |
| Priority date | — |
| Expiry date | Jun 2, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/182
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric motor controller having fault detection comprises: a driver circuit configured to drive an electric motor in response to a received speed demand signal; a measurement circuit configured to measure current through windings of the electric motor, the measurement circuit comprising a back emf, BEMF, observer configured to determine an estimated BEMF value, a BEMF error threshold and an estimated rotor angular speed value from the measured currents; a detector circuit configured to receive the rotor speed demand signal, the estimated BEMF value, the BEMF error threshold, the estimated rotor angular speed value and a measured rotor speed from a rotor speed sensor on the electric motor and to detect a fault in the electric motor controller if the estimated BEMF value lies outside the BEMF error threshold and the measured rotor speed is within a defined rotor speed error threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.