OPERATION CIRCUIT FOR SECONDARY MAGNETIC FLUX, EXCITING INDUCTANCE AND SECONDARY TIME CONSTANT OF INDUCTION MOTOR

摘要

PURPOSE:To operate the secondary magnetic flux, exciting inductance and secondary time constant of an induction motor, by feeding back the deviation between the outputs of voltage and current models to the respective models and performing adjustment so as to bring said output deviation to zero. CONSTITUTION:Secondary magnetic flux is respectively operated by a voltage model 1 consisting of a primary voltage drop operation means 11 and an integrating circuit 12 and a current model 2 consisting of amplifying circuits 21A, 21B an integrating circuit 22 and a feedback circuit 23, and the difference between the operation results of both models is fed back to said models by compensation circuits 3A, 3B. The gains of the amplifying circuits 21A, 21B and feedback circuit 3 of the current model 2 are adjusted by a parameter adjusting circuit 5 so as to bring the difference between the operation results to zero. By this method, secondary magnetic flux can be operated with high accuracy within a wide speed range from a low speed to a high speed and even at the saturation time of magnetic flux, exciting inductance and a secondary time constant can be operated with high accuracy.