Electromagnetic Field Calculation And Analysis Of Axial-Radial Flux Type Fully Superconducting Synchronous Motor

With the development of high temperature superconductors (HTS) technology, high temperature superconducting motor is the very important direction in the motor domain. Compared with the conventional superconducting motor, the armature windings and field coils of the axial-radial flux type fully superconducting synchronous motor (ARFTFSSM) are HTS. This kind of structure gives a full play in HTS and simplifies the cooling system. However, the axial-radial magnetic circle structure increases the complexity of magnetic field distribution. In order to define the magnetic field distribution characteristic and its related factors of the novel motor, the electromagnetic field of ARFTFSSM is analyzed.First of all, the purpose and the significance of studying the high temperature superconducting motor are summarized as well as the present development state at home and abroad. The configuration characteristic of ARFTFSSM and its operating principle are explained in detail. The influence of axial HTS field coils on hybrid magnetic circuit is researched. Design the HTS armature windings arrangement.Then the electromagnetic field of the radial flux type superconducting synchronous motor is calculated and analyzed using linear-time finite element method (FEM). The magnetic field distribution of several rotor structures are analyzed as well as the torque with power angle characteristics, including tangential magnetic pole structure and hybrid magnetic pole structure, single layer PM and double layers PM, uniform and non-uniform air-gap. The influence of rotor structure on radial flux type superconducting synchronous motor is obtained. Finally, on the base of the radial flux type superconducting synchronous motor, the ARFTFSSM is designed by adding axial field device. Moreover, the non-load 3D magnetic field of ARFTFSSM is calculated by using FEM, and the magnetic fields with different axial magnetic motive forces (MMF) are analyzed, from which the influence of axial flux on radial flux distribution is studied. Meanwhile, the results are verified by related experiments on the prototype. Based on the structure of the prototype, the radial air-gap magnetic fields are calculated when different axial air-gap lengths and different magnetic end ring thicknesses are adopted by the rotor. The influence of magnetic end ring thickness and axial air-gap length on radial air-gap magnetic density is analyzed.Some useful conclusions are obtained, which could be beneficial to the further study on optimizing design and performance characteristic analysis of ARFTFSSM, and is the base of loss analysis, heat and cool research.