CONTROL APPARATUS FOR ELECTRIC MOTOR, ELECTRIC VEHICLE PROVIDED WITH SAME, AND METHOD FOR CONTROLLING ELECTRIC MOTOR

A PI calculation unit (230) of a rectangular-wave voltage control unit (200) calculates a control deviation by performing a PI calculation on a torque deviation (”Trq) relative to a torque command value (Trqcom), and outputs a voltage phase (Æv) of a rectangular-wave voltage in accordance with the control deviation. A rate-of-change limiter (235) imposes a restriction on the rate of change of the voltage phase (Æv). Here, the rate-of-change limiter (235) lessens the restriction on the rate of change of the voltage phase (Æv), when the rate of change of the rotational speed of an electric motor (M1) is larger than a predetermined value representing an abrupt change of the rotational speed of the electric motor (M1).