Patent ID: 8587239

Claim:
A method for the identification of electrical equivalent circuit parameters ( 03 , 05 , 15 ) of a three-phase asynchronous motor ( 09 ) without a shaft encoder, comprising at least the steps: taking the rotor to a standstill position ( 11 ); infeeding identical test signal voltage feed U 1α , U 1β in α and β in the stator axis direction of the asynchronous motor ( 09 ); measuring signal currents I 1α , I 1β of the α and β axial direction of the asynchronous motor ( 09 ); identifying equivalent circuit parameters ( 03 , 05 , 15 ) of the asynchronous motor ( 09 ) on the basis of the test signal voltages U 1α , U 1β and of the measuring signal currents I 1α , I 1β ; whereby the test signal feed into the asynchronous motor ( 09 ) takes place in such a manner that the rotor ( 11 ) remains torque-free.