Patent ID: 9379654
Filing Date: 2016-06-28
CPC Classification: H02P

Claim Text:
1. A method for estimating an inductance and/or flux linkage of an electrical machine, wherein the electrical machine is supplied with drive currents via a first current regulator and a second current regulator, and actual values of drive currents are measured and fed back to the two current regulators such that closed-loop control is provided, which method comprises the steps of: providing the first current regulator with an AC value either for a direct axis current reference i* superimposing via a signal-injecting device connected to the electrical machine, after a predetermined time period has expired, a varying signal in a control path where the AC value is provided; and determining, via a calculating device, a contribution signal which corresponds to the contribution of the superimposed varying signal to the drive currents, estimating, via the calculating device, the inductance and/or the flux linkage on the basis of the contribution signal.