A method for detecting a parameter of an induction motor

The method is used for detecting the load condition of an alternating-current induction motor with a main winding, with one or more auxiliary windings and a running capacitor. It is the phase shift between two electrical variables at the motor, for example, the voltage applied to the series-connected with the main winding auxiliary winding voltage and the current flowing through the main winding current is measured and in dependence of the rotational speed or a load parameter of the downstream unit, such as the flow rate of a pump so that it can be determined on the basis of this assignment solely by measuring the actual phase shift of the actual state of the motor.