Control device for rotary machine

Abstract

To provide a control device for a rotary machine capable of suppressing overshoot of a current in a transient state while suppressing deterioration in response of current control in the transient state.SOLUTION: A control device for a rotary machine determines whether or not the rotary machine is in a transient state, sets a voltage upper limit value when it is determined that the rotary machine is in the transient state to be smaller than a voltage upper limit value when it is determined that the rotary machine is not in the transient state, limits a voltage command value before limitation by the voltage upper limit value, calculates a voltage command value after limitation, and performs on-off control of a plurality of switching elements of a power converter based on the voltage command value after limitation.SELECTED DRAWING: Figure 2

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