Patent ID: 7816876

Claim:
A motor control device, wherein, let an axis parallel to a magnetic flux produced by a permanent magnet provided on a rotor of a motor be called a d-axis, let an axis leading the d-axis by an electrical angle of 90 degrees be called a q-axis, and let control axes corresponding to the d-axis and the q-axis be called a γ-axis and a δ-axis, respectively, then, the motor control device performs vector control of the motor with the γ-axis and the δ-axis made different from the d-axis and the q-axis, respectively, and with a motor current passing through the motor broken down into a -γ-axis current on the γ-axis and a δ-axis current on the δ-axis, wherein the motor control device comprises: an estimator that estimates, as an estimated magnetic flux, a flux linkage of an armature winding of the motor, or estimates, as an estimated induction voltage, an induction voltage generated by the flux linkage and a rotation of the motor; and a specified current value deriving portion that derives, by using the estimated magnetic flux or the estimated induction voltage, a specified δ-axis current value to be followed by the δ-axis current, and wherein the motor control device performs vector control of the motor in such a way that the γ-axis and the δ-axis follow an x-axis and a y-axis, respectively, that are different from the d-axis and the q-axis.