SENSORLESS CONTROLLER OF AC MOTOR AND CONTROL METHOD

摘要

A high frequency generator (110) superposes a high frequency signal on estimated magnetic flux. A magnetic flux observer (120) estimates the position of magnetic flux. An error signal at flux position is extracted from voltage/current sense signal. A pair of adaptive adjusters adaptively adjust error signal on high frequency superposition side and flux observer side. A mixer (140) selects the adjusters according to the speed. An independent claim is also included for alternating current motor control method.