Patent ID: 9209734
Filing Date: 2015-12-08
Classification: H02P

Abstract:
1. An apparatus for estimating a parameter of an induction motor including a current controller outputting d and q-axis voltages in a synchronous reference frame from d and q-axis current references and d and q-axis currents in the synchronous reference frame applied to the induction motor and a magnetic flux angle calculating unit calculating a magnetic flux angle by using d and q-axis currents in the synchronous reference frame applied to the induction motor and a rotor speed of the induction motor, in a control system, the apparatus comprising: a state estimator configured to calculate an error of rotor resistance upon receiving an output from the current controller and the d and q-axis currents in the synchronous reference frame applied to the induction motor; an integral controller configured to obtain a difference between the rotor resistance output from the state estimator and nominal rotor resistance; and a calculating unit configured to calculate stator resistance from an output from the integral controller, wherein the calculating unit calculates rotor resistance by a following equation, and the output from the integral controller is provided to the current controller and the magnetic flux angle calculating unit, so as to be updated, wherein R and i ds e is a d-axis current in the synchronous reference frame.