Motor with rotation angle detector, rotation angle detector, and rotation angle detection method

摘要

PROBLEM TO BE SOLVED: To simplify processing within a predetermined angle range. A rotation angle detector calculates a rotation angle based on a voltage and a current between terminals of an electric motor, and outputs a rotation angle signal based on a rotation angle calculation unit and a ripple component included in a current flowing through the electric motor. The first pulse signal generation unit that generates the first pulse signal, the calculation unit that corrects the rotation angle based on both the first pulse signal and the rotation angle signal, and the rotation of the electric motor based on the output of the calculation unit. A rotation information calculation unit for calculating information about the above, and a calculation unit includes a rotation angle within a predetermined angle range when the first pulse signal is first generated within a predetermined angle range. A command to correct to 1 angle is output to the rotation angle calculation unit, and even if the rotation angle is within a predetermined angle range, the first pulse signal generated after the second within the predetermined angle range is ignored. When the rotation angle is out of the predetermined angle range, a second pulse signal indicating that the electric motor has rotated by a predetermined angle is generated. [Selection diagram] FIG. 5