Features of control of positioning motors with double power

Positional electric drives, as a rule, are built on the basis of a synchronous machine with permanent magnets, DC motors with independent excitation, and an asynchronous motor with a squirrel-cage rotor. However, the advantage of using a wound-rotor induction motor is the greater number of possible control channels: currents, voltages and frequencies of the stator and rotor, control of the phase shift between current and voltage, as well as the form of the supply voltage.