Motor control device and magnetic pole position calculation method

Abstract

A motor control device that is connected to an angle sensor that outputs a sine wave signal and a cosine wave signal that change according to a magnetic pole position of a motor, and that calculates the magnetic pole position on the basis of the sine wave signal and the cosine wave signal output from the angle sensor to control the motor using the magnetic pole position, the motor control device including: a phase difference calculation unit that calculates a difference between phases of the sine wave signal and the cosine wave signal; and a phase change unit that changes and corrects the phases of the sine wave signal and the cosine wave signal, respectively, by the same amount so that the phase difference being corrected becomes 90 degrees in terms of an electrical angle on the basis of the phase difference calculated by the phase difference calculation unit.

Dependencies are inferred from the claim text.