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The Basic Research of Axial Flux Inductor Type High Temperature Superconducting Motor

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Tutor: LiLiYi
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: high temperature superconducting motor,windings characteristic,inductance charac
CLC: TM37
Type: Master's thesis
Year:  2008
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Abstract:
With the development of the high temperature superconductor, the liquid nitrogen cooled axial flux inductor type high temperature superconducting motor will be widely applied in the ship propulsion field. Compared with the traditional superconducting motor, this novel motor doesn¡¯t adopt the devices such as: hollow shaft, brush, slip ring, rotating cryogenic vessel, so it gains more advantages. The paper adopts the theoretical analysis and finite element simulation to research the optimal design of the axial flux inductor type high temperature superconducting motor.Firstly, the paper looks back on the development of the high temperature superconductor and superconducting motor. The structure and working principle of the axial flux inductor type high temperature superconducting motor is introduced. Considering the high temperature superconductor, the limiting factor in design process of axial flux inductor type high temperature superconducting motor is analyzed. Through the conceptual design of prototype motor, the motor 3D simulation model is established. The suitable HTS windings are designed. The paper determines the maximum safety current.Secondly, the mathematic model of the axial flux inductor type high temperature superconducting motor is established, and the simplified equivalent magnetic network model is used to analyze the inductance and torque characteristics of the motor. The self-inductance of DC field winding, self-inductance of armature windings and the mutual inductance is analyzed by finite element simulation. The effects of the DC field current, armature current on the inductance characteristics are presented.Thirdly, the different pole-arc ratio, skewed inductor and claw shape inductor are researched to improve the torque characteristic, which provides the reference for the optimal design of inductor size and electromagnetic performance.Finally, the performances of high temperature superconducting windings are researched, which work in the bending, alternating current, alternating magnetic field situation. The armature AC loss and the bending loss are mainly studied, which provides the reference for the optimal design of windings and low temperature cooling system.
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