Patent ID: 8988027
Filing Date: 2015-03-24
Classification: H02P

Abstract:
1. A motor control apparatus comprising: a current reference generating unit that generates a current reference, on which a high frequency signal whose frequency is higher than a drive frequency of a motor is superposed; a drive unit that drives the motor on a basis of a voltage reference; a current detecting unit that detects an output current to the motor from the drive unit; a voltage reference generating unit that generates the voltage reference on a basis of a deviation between the current reference and the output current; a rotational position estimating unit that estimates a rotational position of a rotor of the motor from a calculation parameter including a q-axis inductance of the motor on a basis of the output current and the voltage reference; a change amount estimating unit that estimates a change amount of an output torque with respect to a current phase change of the motor corresponding to the high frequency signal; and an inductance estimating unit that estimates an inductance value that obtains a maximum torque on a basis of the change amount and sets the inductance value in the rotational position estimating unit as the q-axis inductance.