ROTATION ANGLE DETECTION SYSTEM, ROTATION ANGLE DETECTION METHOD, ROTATION ANGLE DETECTION UNIT, AND SYNCHRONOUS MOTOR CONTROL SYSTEM

摘要

The purpose of the present invention is to detect the absolute rotation angle of a rotor in a simple manner. In order to detect the rotation angle of a rotor of a stepping motor including a rotor and stator windings, a first magnetic sensor (151) having a resolution of 200 steps per mechanical angle of 360° detects the rotation angle of a rotor. An incremental encoder (60) outputs a plurality of types of signals periodically in accordance with the rotation angle of the rotor. A rotation angle acquisition unit (122) in a control unit (102) acquires the absolute rotation angle of the rotor on the basis of the rotor rotation angle detected by the first magnetic sensor (151) and the type of signal outputted by the incremental encoder (60).