MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE

摘要

A motor control device includes control calculation means formed by an open loop control unit and a dq-axis/3-phase conversion unit. The open loop control unit obtains voltage instruction values vd, vq on the d-axis and q-axis according to current instruction values id*, iq* on the d-axis and q-axis, the armature winding interlinking magnetic flux quantity f, and the rotor angular velocity ?e in the motor. The dq-axis/3-phase conversion unit converts the voltage instruction values vd, vq into phase voltage instruction values Vu, Vv, Vw. On the other hand, a data acquisition unit acquires angle-dependency data indicating dependency on the electric angle indicated by a secondary higher harmonic component concerning the electric angle of the d-axis or the q-axis component of the motor current according to the current detection value ia and the electric angle ?. A correction coefficient decision unit decides a correction coefficient for correcting the phase voltage instruction value so as to reduce the dependency according to the angle-dependency data. A correction execution unit corrects the phase voltage instruction values Vu, Vv, Vw obtained by the dq-axis/3-phase conversion unit, according to the decided correction coefficient.