System for controlling controlled variable of rotary machine

A system for controlling a controlled variable of a rotary machine having plural-phase input terminals of the rotary machine in which plural-phase AC power is applied from an AC power applying module to the plural-phase input terminals, the system comprising:

• a command-voltage setting module configured to set, based on a request value for the controlled variable, plural-phase AC command voltages for the plural-phase AC power as a feedforward manipulated variable;
• a current obtaining module configured to obtain plural-phase AC currents flowing in the respective plural-phase input terminals of the rotary machine;
• and
• an amplitude correcting module configured to correct an amplitude of at least one of the plural-phase AC command voltages based on magnitudes of the plural-phase AC currents obtained by the current obtaining module.