The control device of the motor driving apparatus
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Provided is a control device for a motor-driving device that can decide upon a system-voltage command-value, quickly and appropriately, according to the actual voltage supplied to the motor; increase the efficiency of the motor-driving device with that command-value; and increase the follow-up capability of the system voltage in regard to the operating state of the motor. The control device (2) for controlling the motor-driving device, provided with a voltage conversion unit that converts power-supply voltage coming from a DC power-supply and generates the desired system-voltage (Vdc), and a DC-AC conversion unit that converts the system-voltage (Vdc) into AC voltage and supplies it to the motor, is also provided with; an AC-voltage-command deciding unit (7) that decides the command-values (vd, vq) for the AC voltage to be supplied to the motor from the DC-AC conversion unit, based on the target torque (TM) and rotating velocity (Omega) of the motor; and a system-voltage-command deciding unit (9) that decides the command-value (Vdct) for the system-voltage (Vdc) to be generated by the voltage conversion unit, based on the AC voltage command-values (vd, vq) and the system-voltage (Vdc).