VECTOR CONTROL APPARATUS FOR INDUCTION MOTOR, VECTOR CONTROL METHOD FOR INDUCTION MOTOR, AND DRIVE CONTROL APPARATUS FOR INDUCTION MOTOR

摘要

The vector control device includes: secondary magnetic flux command computing means (40) for computing a secondary magnetic flux command to an induction motor (6) by taking a maximum voltage that an inverter (4) can generate into account on a basis of a torque command from an external, a DC voltage to be inputted into the inverter, and an inverter angular frequency, which is an angular frequency of an AC voltage to be outputted from the inverter; q-axis/d-axis current command generating means (8 and 9) for generating a q-axis current command and a d-axis current command on a d-q axes rotating coordinate system in reference to a secondary magnetic flux of the induction motor (6) on a basis of the torque command and the secondary magnetic flux command; output voltage computing means (voltage non-interference computation portion 14, adder 17, and adder 18) for computing an output voltage that the inverter (4) is to output on a basis of the q-axis current command, the d-axis current command, and a circuit constant of the induction motor (6); and voltage command/PWM signal generating means (50) for controlling the inverter (4) for the inverter (4) to output the output voltage.