INDUCTION MOTOR VECTOR CONTROL DEVICE, INDUCTION MOTOR VECTOR CONTROL METHOD, AND INDUCTION MOTOR DRIVE CONTROL DEVICE

摘要

An induction motor vector control device comprises secondary magnetic flux command computing means (40) for computing a secondary magnetic flux command (f2*) from the torque command (Tm*), DC voltage (Efc), and the angular frequency (?) of an inverter (4), q-axis/d-axis current command generating means (8/9) for generating a q-axis current command (Iq*) and a d-axis current command (Id*) on a dq-axis rotating coordinate system with reference to the secondary magnetic flux of an induction motor according to the torque command (Tm*) and the computed secondary magnetic flux command (f2*), feedfoward voltage computing means (voltage noninterference computing section (14)) for computing the q-axis feedforward voltage (Eq*) and d-axis feedforward voltage (Ed*) according to the generated q-axis and d-axis current commands and the circuit constant of the induction motor irrespective of the saturation state of the output voltage of the inverter, and voltage command/PWM signal generating means (50) for issuing an output voltage command to the inverter according to the computed q-axis feedforward voltage and d-axis feedforward voltage.