The motor control apparatus and control method thereof

Even if the DC bus voltage of the power conversion circuit is varied constantly to provide high efficiency and operated at the maximum voltage the motor control device and its control method. d, q-axis current instruction operation section (1, 2), dq conversion section (9), the current control part (3), modulated wave instruction operation section (5), PWM generating unit (6), the the motor control apparatus having a modulated wave instruction limiter unit for generating a second modulated wave instruction limits the first modulated wave instruction (13), the modulation from the limit value of the first modulated wave instruction and the modulated wave instruction limiter unit modulation rate saturation degree operation section obtaining the percentage saturation (14), a field control portion weakening corrects the d-axis current command value based on the modulation rate saturation degree (4), comprising a.