Finite Element Method Based Determination of Non-linear Inductances of Three Phase Induction Motor

Abstract

AbstractAccurate parameter determination of any type of motor is an important aspect that further provides accurate motor performances. Equivalent circuits are widely used and are convenient means of computing the performances of three-phase induction motors. Amongst various equivalent circuit parameters, inductances are associated with the core material non-linear B-H curve, whose operating point shifts with the motor load. This results in motor inductances becoming non-linear with the variation of load on the motor The method presented in this work determines the non-linear inductances of the three-phase induction motor implemented on finite element method (FEM) developing the two-dimensional motor model in FEM package ANSYS Maxwell Electronics Desktop. Mainly performing two tests on FEM, all the motor non-linear inductances are determined. For the sake of comparison of the results obtained, constant values of motor inductances are also obtained from the conventional tests on the induction motor i.e. stator winding D.C. resistance test, no-load test, and the blocked rotor test. These conventional tests for determining the constant values of motor inductances are also performed on the FEM package, ANSYS Maxwell. Finally, all the results are presented.KeywordsFinite element methodEquivalent circuitsNon-linear inductance measurementThree-phase induction motorsParameter estimationTests