Patent ID: 11870374
Assignee: VOLVO TRUCK CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 14:
15. A controlling apparatus for controlling the operation of an electric traction machine being a permanent magnetic synchronous motor (PMSM) the controlling apparatus being configured to:
provide a flux linkage of permanent magnets (PM flux) in the PMSM, by that the controlling apparatus is configured to decouple the PMSM from drive shaft and to perform a first retardation test to measure the flux linkage of the permanent magnets (PM flux) in the PMSM;
perform a stand still characterisation of the PMSM to estimate linked magnetic flux as a function of current;
add the PM flux to the estimated linked magnetic flux to provide a flux characteristic of the PMSM;
adapt the control parameters of the PMSM based on the flux characteristic.