ROTATION ANGLE DETECTOR AND MOTOR CONTROLLER

摘要

PROBLEM TO BE SOLVED: To provide a rotation angle detector and a motor controller including a subsystem rotation angle detection unit capable of detecting abnormality in a main-system rotation angle detection unit at low cost with high reliability.SOLUTION: A rotation angle detector comprises: an excitation signal generation unit generating an alternating-current excitation signal; a main-system resolver digital conversion unit converting an analog output signal from a resolver to which the excitation signal is input into a main-system digital rotation angle signal; a peak detection unit detecting a peak of the excitation signal; an A/D conversion instruction unit generating an A/D conversion timing signal based on a detection signal of the peak detection unit; a subsystem A/D conversion unit converting the analog output signal to subsystem sine and cosine signals based on the A/D conversion timing signal; and a subsystem rotation angle conversion unit to which the subsystem sine and cosine signals are input and that outputs a subsystem digital rotation angle signal. The rotation angle detector performs rotation angle filtering on the subsystem digital rotation angle signal differently from the main-system resolver digital conversion unit.