| 摘要 |
PURPOSE: An apparatus for controlling a sensorless vector of an induction motor is provided to prevent mechanical strength of an induction motor from being deteriorated by using a sensorless control technique. CONSTITUTION: The first comparator(1) obtains an error between an actual rotational speed of an induction motor and a speed command value inputted from the outside, and outputs the same. A speed controller(2) generates a torque current command value from the error. A magnetic flux command value generator(3) generates a magnetic flux command value. The second comparator(4) obtains an error between the magnetic flux command value and a magnetic flux estimated value. A magnetic flux controller(5) generates a magnetic flux current command value. The third comparator(7) obtains an error between an actual torque current flowing in the induction motor and a torque current command value generated in the speed controller(2), and outputs a current/torque according to the error. The fourth comparator(6) outputs a current/magnetic flux. A current controller(8) converts a current/torque and a current/magnetic flux into a voltage command value/magnetic flux and a voltage command value/torque, respectively, and outputs the same.
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