INDUCTION MOTOR SPEED ESTIMATION APPARATUS USING FLUX OBSERVER AND INDUCTION MOTOR CONTROL SYSTEM USING THE PROPOSED APPARATUS

摘要

speed estimator and control system of induction motor is presented using the same observer using a flux. Speed estimation device of the present invention, the stator voltage and flux observer that observes the rotor flux from the current and the rate estimator for calculating an estimated magnetic flux each using the estimated motor speed, and calculates the estimated motor speed using the rotor flux includes. And, in addition to the control system the speed estimation device of the present invention, based on the q-axis (torque component) current for outputting a speed controller, based on the d-axis (magnetic flux component), the magnetic flux controller for outputting a current, the reference q-axis current and the q-axis actual using each of the current error and the error of the reference d-axis current and the actual d-axis current and q-axis voltage reference value and for outputting a d-axis q-axis voltage reference values, d-axis current controller, the coordinate conversion unit, 2/3 phase conversion unit an induction motor and an inverter for driving. According to the present invention, by estimating the speed of an induction motor using the flux observer, the speed sensor attached to effectively calculate the velocity of the induction motor, even when there is a possibility that an erroneous operation of the overall system performance degradation of the difficult environment and speed sensor can be.