DISPOSITIVO DI CONTROLLO DI UN MOTORE ELETTRICO IN CORRENTE ALTERNATA

The circuit has an electrically coupled phase current regulator and a phase regulator connected to a memory. Interconnected with them is a device for analysing the condition of the phase regulator. The memory is connected to the control unit which is followed by a rotating filled inverter supplying the motors and with a d.c. supply connected to it. Between the inverter and the motor are connected current indicators for two phases connected to a function converter for excessive oscillations of the phase currents. This has two feedback lines connected to the phase regulator and for a shaper for feedback signals for the third phase. The device which analyses the condition of the phase regulators, has three connections in common with the memory and the regulators formed by the outputs of the regulators. The function converter has two phase shifting members between output and input for controlling the phase current oscillations.