Abstract
The various measurement procedures for determination of electromagnetic parameters for the induction motor (IM) equivalent circuits including the rotor deep-bar effect were proposed in the literature. One of them is the procedure based on the load curve test (LCT). Since the execution of the LCT can pose some difficulties, especially in industrial conditions, as an alternative, the finite element method (FEM) can be employed to simulate the IM operation under the LCT. In this work we developed the optimisation technique for the finite element (FE) model. This technique is performed with the use of the stator current space-vector components which determine the IM input active and reactive power consumption during no-load operation. Relying on the LCT simulation carried out with the optimised FE model the inductance frequency characteristic can be determined and then used as the reference characteristic in the electromagnetic parameter estimation for the IM equivalent circuit including the rotor deep-bar effect. The presented research results demonstrate proper conformity between the inductance frequency characteristics obtained from the LCT performed experimentally and determined by means of the optimised FE model. Satisfactory conformity is also achieved in the case of the torque-versus-slip frequency curves acquired from the measurement and calculated by the IM space-vector model with estimated electromagnetic parameters. All of this validates the effectiveness of the proposed technique for the FE-model optimisation and the usefulness of the presented approach using the FEM in the electromagnetic parameter estimation for the IM equivalent circuit including the rotor deep-bar effect.
Highlights
Numerical methods such as the finite element method (FEM) are effective tools for analysing and modelling electrical machines
The paper presents an effective optimisation technique for the FE model which is intended for determination of the reference frequency characteristic employed in the
The paper presents an effective optimisation technique for the FE model which is intended for determination of the reference frequency characteristic employed in the electromagnetic parameter estimation of the induction motor (IM) equivalent circuit including the rotor deep-bar effect
Summary
Numerical methods such as the finite element method (FEM) are effective tools for analysing and modelling electrical machines. Analytical methods are characterised by certain constraints, i.e., the simplified geometry of motor and rotor cage bar models, isotropic material properties and a model feeding usually reduced to the current fundamental harmonic These all affect the accuracy of electromagnetic field calculations and so the electromagnetic parameter estimation for the IM space-vector models. The FEM is devoid of such constraints and allows one to model the exact IM geometry and material properties of its individual components without limiting the model feeding to the current fundamental harmonic For this reason, the FEM is an attractive alternative to the measurement procedures for the reference characteristic determination in the electromagnetic parameter estimation of the IM space-vector models. Estimation of IM Equivalent Circuit Electromagnetic Parameters Based on the Inductance Frequency Characteristic
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