Analysis of Quasidiamagnetic Superconducting Rotating Machine

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Dr. Vajda István
Department of Electric Power Engineering

In my thesys, I investigate the behaviour of the quasi-diamagnetic machine theoretical constructions with finite-element method simulations. In the introduction I present the method of the investigation, the behaviour of the machine – the cause of the generated torque, the generated repulsive force by setting quasi-diamagnetic material near the electromagnetic field -, than I compare the experienced phenomenon with other, conventional electrical machine’s phenomenons. After this, I sketch a few optional theoretical constructions.

I present my initial motor model, describe the function of the elements, geometrical parameters and the physical parameters of the used materials.

We can tabulate these versions by many aspects, for example: the type of the excitation, the rotor geometry, used materials. I investigate two types of pulse excited and one type sinusoidally excited machine and a fourth tire type, axially excited model.

Including the rotor geometry I investigated that how the generated torque affects by changing the different rotor parameters. I’m trying to identify the most important parameters of design.

From the aspect of the used materials I distinguish copper and Type II high-temperature super-conducting material winding stator. Thats is important, because by the usage of this material, the stator can be excited with higher current, which icreases the torque of the and it is possible to reach bigger external magnetic field in the air gap which increases the torque of the quasi-diamagnetic machine. At this point, I present one of the possible implementation of the ironless electrical machine. I compare the construnctions in the aspect of how the torque changes along the gap.

Moreover I present the experiments which were investigated with primitive models of the quasi-diamagnetic machine to prove the theory. My further goal is to use commercially available superconductors to build a prototype of the quasi-giamagnetic machine, where I can measure the torque to prove the results of my simulations.

At this phase of my work, I try to select the most optimal, efficient and feasible concept of the quasi-diamagnetic machine, then identify formules by measurement to assist the further design.

The final goal of my project is to design and manufacture a functional machine, which can be used in industrial applications. Primarily a high efficient flywheel energy storage system is the goal, which can be connected to the power system.


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