Patent ID: 8193749

Claim:
A control device for controlling a multi-phase electric rotating machine by controlling a power inverter circuit to output a controlled voltage of a multi-phase current to the machine, comprising: a phase determining unit that determines a phase of the controlled voltage at a controlled phase to control an operating torque, generated in the machine from the controlled voltage set at the controlled phase, to a target torque under a torque feed-back control; a norm calculating unit that calculates an instructed vector norm of the controlled voltage while using a parameter indicating a characteristic of the machine to control a current, flowing through the machine in response to the controlled voltage set at the instructed vector norm and the controlled phase, to an instructed current corresponding to the target torque under an open-loop control; a norm correcting unit that corrects the instructed vector norm of the norm calculating unit to an adjusted vector norm to control an operating current, flowing through the machine in response to the controlled voltage set at the adjusted vector norm and the controlled phase, to the instructed current under a feed-back control; and a torque feed-back control unit that controls the machine to generate the target torque in response to the controlled voltage, set at the controlled phase of the phase determining unit and the adjusted vector norm of the norm correcting unit, under the torque feed-back control.