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AssigneeVolvo Truck Corporation
InventorSebastian Hall
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A method for categorizing performance of a PMSM coupled to a drive shaft, and powered by a battery via an inverter. The method comprising: decoupling the PMSM from drive shaft; performing a first retardation test to measure the flux linkage of the permanent magnets, PM flux, in the PMSM; performing a second retardation test in which the inverter is disconnected, to measure the no-load power losses of the PMSM; correlating the PM flux with the no-load power losses in a health parameter of the PMSM, and comparing the health parameter with reference data of known health parameters of a population of PMSMs; categorizing the performance of the PMSM based on the compared health parameter.
A method for categorizing performance of an electric traction machine being a permanent magnetic synchronous motor, PMSM, the PMSM being coupled to a drive shaft, and powered by a battery via an inverter, the method comprising:
The method, comprising:
A controlling apparatus for controlling the operation of an electric traction machine being a permanent magnetic synchronous motor, PMSM, the PMSM being coupled to a drive shaft, and powered by a battery via an inverter, the controlling apparatus being configured to:
Dependencies are inferred from the claim text.