METHOD AND APPARATUS FOR DETERMINING ROTOR IMPEDANCE FOR ROTARY MAGNETIC FIELD MACHINE

摘要

PURPOSE: To determine the impedance of a rotor while suppressing the error by regulating a deviation correlated with the high frequency component of model component caused by the shift of model parameter from the impedance of rotor. CONSTITUTION: A stator current corresponding to a target vector VI*(S) is fed to a rotating magnetic field machine and the component parallel with the model flux VF (S) thereof contains a sine wave component HF' having higher frequency than the rated frequency of rotating field machine. A model component EFI of the electromotive force vector of rotating magnetic field machine parallel with the model flux VF(S) is then calculated based on a current model. A deviation DE from a model component EF1' calculated from a voltage model and correlated with the high frequency component of model component EF1 is then regulated based on the shift of model parameter from the impedance of rotor.