Abstract: An induction motor control device includes a power conversion circuit, a current sensor, a current component calculation circuit for calculating first and second current components, a magnetic flux command calculation circuit for calculating a magnetic flux command value such that the amplitude ratio between a squared value of the first current component and a squared value of the second current component takes a preset value, a voltage component calculation circuit for calculating a primary voltage component command value, and a primary voltage component command calculation circuit. The current component calculation circuit calculates first and second current components in phase and 90° out of phase with the primary voltage component command value, respectively.

Abstract: An estimated rotation angular velocity □r0 and an estimated secondary resistance Hr0 are processed using a first feedback gain H1 under a condition that a first state deviation E1 is in phase with a quadrature component of an estimated secondary magnetic flux □r01. An estimated primary resistance Rs0 is processed using a second state deviation H2 under a condition that a second state deviation E2 is in phase with an estimated primary current 02. These values are used to control the speed of an induction motor without an angular velocity detector.