ROTATIONAL-ANGLE DETECTION DEVICE AND ELECTRIC POWER-STEERING DEVICE PROVIDED WITH ROTATIONAL-ANGLE DETECTION DEVICE

摘要

When a shaft misalignment detection part (122) detects occurrence of a shaft misalignment that is a misalignment in a relative position in a radial direction of a rotary shaft between a magnet part and a sensor part, the shaft misalignment detection part (122) outputs a shaft misalignment determination flag F (=1) to a correction part (124) and a control change instruction part (1301). The correction part (124) calculates a motor rotational angle ¸ so as to reduce a detection error caused by the shaft misalignment. The control change instruction part (1301) outputs instructions Ct and Ci of changing calculation methods so that influence by the detection error decreases to an assist torque setting part (1011) and an assist current instruction part (1021).