Analysis of magnetic fields in the slotted structure of a superconducting AC generator

An analytical model has been developed to help determine the distribution of the magnetic flux density inside the superconducting AC generator. The model takes into account the number, and the geometric structure, of the winding slots and allows the rotor of the superconducting machine to be designed with optimum magnetic field distribution. The results obtained by the model are verified by comparison with results obtained by former models. The new model is also used to study the influence of the field winding geometry on the magnetic flux density distribution. The authors also review two-dimensional modelling methods for calculating the magnetic field inside a superconducting AC generator, and highlight some of the problems and opportunities for the application of these methods to magnetic field analysis of superconducting field winding