Patent ID: 7068001

Claim:
A motor control system comprising: a) a magnetic encoder including a magnetic drum fixed to an output shaft of a motor, and a magnetic sensor provided against a periphery of said magnetic drum through a space; b) an angle calculating means for calculating a rotational angle of said motor from an output of said magnetic encoder; c) an angle estimating means for estimating said rotational angle; d) an error angle calculating means for finding an error angle from a calculated angle calculated by said angle calculating means and an estimated angle estimated by said angle estimating means; e) an error-correction value calculating means for calculating from said error angle an error-correction value that corresponds to said rotational angle; f) a correction calculating means for calculating a correction angle or a correction speed from said calculated angle and said error-correction value; and g) a motor operation controlling means for outputting to an inverter a voltage command value that corresponds to said correction angle or said correction speed.