Analysis of starting characteristics of asynchronous motors

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Dr. Vajda István
Department of Electric Power Engineering

The topic of the present thesis is the comparison of traditional, analytical machine scaling and the numerical field calculation. Nowadays, computing makes it possible to make complicated and lengthy finite element simulations with relatively short running time. Due to this, it is possible to gain some kind of calculation results, which can be used in the planning process of electrical machines. The present work consists of three main parts. In the first part, machine scaling by an analytical programme is to be presented. In the second part finite element simulation of two asynchronous machines is to be focused on. Finally, a comparison analysis is to be carried out. The machine is a special, deep bar induction motor which is scaled in the first part. Through this machine example I could study the operation of the analytical scaling programme which is used in CGE (CG Electric Systems Hungary ZRt.). The simulations of the two asynchronous motors which I got from CGE are presented in the second part. Scripts for the machines models are to be written in this section of the thesis. These models could be run in a finite element calculation programme called Tr-FEM. One of the machines is a double cage, directly started, while the other is a wound rotor induction motor. In the last part of the present work there is comparison analysis to present the differences between the two types of calculation methods.


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