Abstract: A control circuit for the current in a pair of coils, which are utilized for generating a rotating magnetic field, supplies a sinusoidal current to each coil during the normal, operate mode and a maximum DC current to the coils whenever the operate mode is initiated or stopped. Each coil is a common element in the sinusoidal and DC current supplying circuits. A transistor switch, which is open during the operate mode, is connected in series with the coil in the circuit for the DC current and is connected in parallel with the coil in the circuit for the sinusoidal current through the coil. Since the switch is open and is connected in series in the circuit for the DC current no DC current flows through the coil during the operate mode. Whenever the operate mode is initiated or stopped, the transistor switch is closed so that both the sinusoidal and DC currents flow through the switch.