METHOD FOR CONTROLLING SPEED OF INDUCTION MOTOR

摘要

PURPOSE: A method for controlling the speed of an induction motor is provided to improve the speed control performance by estimating the speed of the induction motor by means of a model reference adaptive system. CONSTITUTION: A current equation of a rotor is represented by a d-q static coordinate and a d-q synchronous coordinate when a stator of an induction motor discharges voltage. A stator flux and a rotor flux are represented by a d-q static coordinate and a d-q synchronous coordinate, respectively. A voltage model and a current model are extracted from a voltage equation of the stator, the current equation of the rotor. The voltage model and the current model are respectively set to a reference model and a variable model of MRSA(Model Reference Adaptive System). Estimating the speed of the induction motor is performed through MRSA that minimizes error between outputs from the voltage model and the current model. Controlling the speed of the induction motor is performed on the basis of the estimated speed.