The task of the thesis work was to create a software tool that would calculate and analyze the distribution of the magnetic field in the air gap for different forms of windings and stator laminations of electric motors. The distribution of the magnetic field in the air gap contains spatial harmonic components resulting from different types of windings, stator geometry, etc.
Firstly, the thesis presents three-phase distributed windings, which are one of the main ways to create a rotating magnetic field. In a simple example of a two-pole machine, designing of the winding was demonstrated, for which we also calculated the magnetic voltage, which is a good approximation of the magnetic field distribution along the air gap. It was found that the shape of magnetic voltage deviates significantly from the ideal sine wave, since it is composed of several higher harmonics that affect its shape. They are also called spatial harmonic components, which cause additional engine malfunction and are mostly undesirable. Therefore, we used the FEMM software tool to calculate the magnetic field distribution along the air gap for different types of windings and stator geometries, and then determined the spectrum using a discrete Fourier transform.
The aim of the thesis was to demonstrate and analyze the phenomenon of higher harmonic components in different stator geometries, a single-layer winding and a double-layer winding with pitch shortening. Due to a large number of simulated cases, only the basic ones and those that stand out from the others were included in our analysis, thus avoiding repeated results and improving their transparency.
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