Patent ID: 7948201
Filing Date: 2011-05-24
Classification: H02P

Abstract:
1. An induction motor control device having an inverter circuit for driving an induction motor by outputting a command voltage to the induction motor, comprising: a current detector for detecting an output current of the inverter circuit; a magnetic flux estimation observer for generating an estimated magnetic flux, an estimated current, and a phase command for the induction motor using the command voltage and the detected output current; a primary angular speed estimator for estimating a primary angular speed of the induction motor using the estimated magnetic flux; a slip compensator for calculating a slip angular frequency of the induction motor using the output current; a first angular speed estimator for estimating a first angular speed of the induction motor using the primary angular speed and the output current; a second angular speed estimator for estimating a second angular speed of the induction motor using the output current, the estimated magnetic flux, and the estimated current; and a resistance estimator for estimating a secondary resistance value of the induction motor using the estimated first and second angular speeds.