CONTROL APPARATUS FOR INDUCTION MACHINE

PURPOSE:To accurately control an induction machine by learning and correcting the transfer coefficients so that the conversions to the secondary current and the exciting current on from a command value and the exciting voltage of the actual value become equal. CONSTITUTION:When a torque command Tc* is given, an internal voltage command (IV) e1'* of an instantaneous value is outputted in response to a number of rotation fr from a model 40. A neural network (NN) 30 converts the IV e1'* into a secondary current command (SI) i2* and an exciting current command (EI) i0* and outputs signals U1 and U2. Switches 31 and 32 are switched to the upper side as required. The actual internal voltage e1' of an induction machine 1, which is detected through an operator 14, is read with the NN 30 and converted into the SI i2* and the EI i0*, and the results are outputted. The values are made to be V1 and V2. When U1=V1 and U2=V2 are different at this time, the transfer coefficients including a slip frequency fs, a mutual inductance M and a secondary resistance R2 are learned and corrected so that U1=V1 and U2=V2 are obtained.