| Magnetic levitation could operate contactlessly, has the advantages of low noise, low maintenance and high reliability, it could be used in transportation, special motors, robot and metal working.A new configuration of maglev system-High Temperature Superconducting Coreless Induction Maglev Motor (HTS CIMM) is proposed in this dissertation,the system uses electro-dynamic levitation principle, moving magnetic field (MMF) in its air-gap is generated by3-phase AC current in the primary windings,the interaction between MMF and secondary eddy current inducted by MMF produces lift force and horizontal force. This system’s structural is stable,its control is simple,it can realize intrisic stable static levitation and guidance, has a widely application prospect.It is not suitable to copy indiscriminately the research method and experience of the traditional motor for HTS CIMM.The research on the HTS CIMM a pioneering study and advanced subject,is in theory exploration stage at present.A series of analyzing tools was proposed to analyze the motor’s electromagnetic field,force characteristics, inductance parameters and the equivalent circuit.The fundamental principle of the HTS CIMM is demonstrated.By using the electromagnetic theory the electromagnetic relationship is formulated.The magnetic field is formulated by analyzing permanent magnet electro-magnetic levitation and rotating magnetic field electro-magnetic levitation.The influence of the structural parameters on the performance of the HTS CIMM is presented.Compare the advantages and disadvantages of kinds of maglev motors,the result shows that the rotating magnetic field has more advantages.The characteristics of the HTS winding coils are analyzed.According to the features of the HTS winding coils and considering the primary winding without core, electromagnetic HALBACH array is proposed by analyzing the permanent magnet HALBACH array.The results show that Coreless electromagnetic HALBACH and PM Halbach magnet array have the same characteristics.Based on the above analysis, a new type of moving coreless HTS electromagnetic HALBACH array is proposed.A kind of magnet field analytical method based on Fourier decomposition is proposed.This method can be used in all areas including winding current layers and is convenient for harmonic analysis of magnet field.A study is made on the variations of air gap magnetic field with different forms of windings.The results show that coreless electromagnetic HALBACH is more effective in improving air gap magnetic field distribution.According to the features of the machine structure, the computation model is simplified, and the electromagnetic field of the HTS CIMM is computed by analytical calculation.The comparison of the analytical calculation result and FEM result has confirmed the correctness of this method. The Equivalent Circuit of the HTS CIMM is obtained.The fundamental difference between a rotary motor and HTS CIMM is the open air-gap which affects the transverse and longitudinal magnetic fields.Based on the magnet field analytical method, a new type of theory, which includes simultaneously the longitudinal and transverse effects, together with the effect of the effect of a large air-gap and the secondary skin effect, is proposed. The lift force, horizontal force, and the power factor, are obtained.According to the manufacture and the test of the prototype motor with copper windings, the force characteristics and Parameters of prototypes were tested. The experimental results of lift force and Parameters have proved the correctness of the computation and analysis above.In short, through the study of the magnetic circuit, the electrical circuit and the performance of the HTS CIMM, the design theory and the analysis method of the HTS CIMM are set. According to the manufacture and the test of the prototype motor with copper windings, the accuracy of these theories and methods are validated. And it has a good reference value for the design and the application of the HTS CIMM. |
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