Method of estimating field pole position of synchronous motor, motor controller, and electric vehicle

摘要

A power corresponding to an A/C voltage command id1* is applied in the d-axis direction of rotational coordinates of a stopped synchronous motor via a current control unit, a three-phase converting unit, and a power converter. Further, by using "an amplitude value of a current iq' in the q-axis direction of the rotational coordinates generated in response to the A/C voltage command id1*" which is fed back and detected via a current detector and a dq converting unit, a field pole position estimation value theta{circumflex over ( )} is converged. The field pole position is estimated by using the converged field pole position estimation value theta{circumflex over ( )} as a true value of the field pole position theta of the synchronous motor.