Estimação de parâmetros de motores de indução trifásicos utilizando evolução diferencial

Abstract

Three-phase induction motors are the most used in industry due to their low cost, ruggedness, and ease of maintenance compared with other types of engines, such as direct current, for example. All motors these one a drive system and control and, therefore, require the values of their parameters as stator resistance and rotor, stator leakage inductance and rotor magnetizing inductance, moment of inertia and coefficients friction. However, in some cases it is not possible to have access to these data immediately or they may be altered by abrasion from use of the engine. To be able to estimate these parameters automatically and quickly, this paper proposes a method using differential evolution, developed in MATLAB® software, that to estimate the above parameters using as an input signal both the curve of the current phase as the combination of the speed curve and a stream of the phases. The results were satisfactory for both input signals, but the best results were found using only the current as the input signal, making the method more simply and with low computational cost. Method validation tests were performed with simulated curves by computer tool MATLAB® / Simulink and with experimental data acquired from a 1 hp motor. The method using differential evolution was compared with the test method vacuo and the locked rotor for estimating the same parameters for the same engine under the same operating conditions. The differential method showed most effective results.