Abstract
Based on the analysis of the transverse flux machine designs, they were found to have a relative design simplicity and a high-power density. The purpose of this work is to determine the optimal height of a permanent magnet and to define its effect on the induced EMF value in the stator coils and the cogging torque, as well as to define the picture of the magnetic flux leakage between the stator poles. To achieve these goals, the 3D model of a low speed generator was studied. The electromagnetic analysis was carried out using a modern software, which allows us to determine the magnetic field distribution in the 3D, as well as the induced EMF value and the rotor cogging torque. The criterion for the optimal calculation is the highest EMF value at the minimum value of the rotor cogging torque. The parameters of the permanent magnets, such as the width and length, remained unchanged, whereas, the height varied from 1 to 8 mm at a 1-mm step. The corresponding dependencies are obtained for each height. The most significant result of the work is the conclusion that the height of the permanent magnet should not exceed the 3-mm value. The significance of the obtained results is that the used methodology allowed finding the optimal height of the permanent magnet, since a further increase in its height leads to no growth in the EMF value, but rather significantly enhances the negative effect from the rotor cogging torque. In addition, the simulation results were supported experimentally.
Highlights
It is commonly known that the electrical machines with permanent magnets (PMs) demonstrate higher efficiency, greater reliability than machines with electromagnetic excitation
The purpose of this work was to investigate the tendency of the influence of the permanent magnet thickness on the induced electromotive force (EMF) value in the stator coils and the cogging torque value, as well as to determine the picture of the magnetic flux leakage between the stator poles
THE RESEARCH RESULTS Magnetic system analysis to find the optimal height of the PMs was carried out with the preservation of all the main dimensions of the machine and the air gap
Summary
It is commonly known that the electrical machines with permanent magnets (PMs) demonstrate higher efficiency, greater reliability than machines with electromagnetic excitation. Among the electric machines with the PMs, there is a separate class of transverse magnetic flux machines (TFM). Due to the design features of this TFM magnetic system, the relatively simple design and creation of the best indicators of the specific power TFM find wide interest in the scientific community. For the first time the TFM was proposed by V.
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