Patent ID: 6984958

Claim:
A method for defining quadrature-axis magnetizing inductance of a synchronous machine when the synchronous machine is fed with an inverter, wherein the method comprises the steps of starting the synchronous machine without load or with reduced load, keeping the rotor current of the synchronous machine substantially at zero, accelerating the synchronous machine to initial angular velocity of measurement, controlling the load angle (δ s ) of the synchronous machine substantially to 90 degrees, defining the stator voltage (ū s ) the stator current (ī s ) and the electrical angular velocity (ω) of the synchronous machine, and defining the quadrature-axis magnetizing inductance (L mq ) of the synchronous machine on the basis of the stator voltage (ū s ), the stator current (ī s ) and the electrical angular velocity (ω) of the machine.