METHOD FOR ESTIMATING INDUCED ELECTROMOTIVE FORCE AND SPEED OF INDUCTION MOTOR, METHOD FOR CORRECTING MISALIGNMENT OF SHAFT THEREOF, AND INDUCTION MOTOR CONTROLLER

摘要

A three-phase-to-two-phase converter (10) detects two-phase currents of three-phase stator currents, converts the stator currents into a gamma - delta coordinate system to derive a gamma -axis current and a delta -axis current. The gamma -axis current, the delta -axis current, and voltage command values outputted respectively from a gamma -axis current controller (2) and a delta -axis current controller (3) are entered to a stator current and induced electromotive force estimator (9), which determines estimated values of the stator currents and estimated values of an induced electromotive force in the gamma - delta coordinate system. IMAGE