Patent ID: 7646164

Claim:
Method of adjusting motor parameters in a variable speed drive intended for controlling a synchronous electric motor with permanent magnets (M), the method being characterized in that it comprises: a step of determining a first deviation (ΔI Q ) between a reference of the motor torque current (I Qref ) and a measurement of the motor torque current (I Qm ), and a second deviation (ΔI D ) between a reference of the motor flux current (I Dref ) and a measurement of the motor flux current (I Dm ), a step of calculating a correction value (ΔR S ) of the stator resistance of the motor, a correction value (ΔL) of the motor inductance and a correction value (ΔK E ) of the flux constant of the motor, on the basis of the integral term of the said first deviation (ΔI Q ) and of the integral term of the said second deviation (ΔI D ), a step of adjusting the values of the parameters of the motor model on the basis of the said correction values (ΔR S , ΔL, ΔK E ) of the stator resistance of the motor, of the motor inductance and of the flux constant of the motor, a step of formulating the control voltages (U D , U Q ) to be applied to the motor (M) by using the said adjusted values of the motor parameters.