Temperature influence analysis on parameter estimation of induction motors using differential evolution

Abstract

Three-phase induction motors are widely used in industry due to their low cost and ruggedness compared with other electromechanical conversion machines, as the direct cur-rent motors, for example. Systems and control drives (DTC, FOC and V/f) are applied in industry, so it is important to know the electrical and mechanical parameters of the machine, such as, stator and rotor resistances, stator and rotor leakage inductance and magnetizing inductance, moment of inertia and friction coefficients. However, parameters like stator and rotor resistances suffer influences throughout its use due to external factors, such as temperature, which impairs the machine efficiency. In the search for a method to find these parameters, even with the changes provided by the temperature influence, this work proposes the use of differential evolution for the estimation of the parameters using as input the curve of a single phase stator current. Tests were realized using four different temperature values, and for each one it was assigned a corresponding input, in order to analyze the temperature influence on stator and rotor resistance. The results presented show that it is possible to estimate the motor electrical and mechanical parameters even with the changes provided by the temperature influences.