Simulation of an axial-flux induction machine with squirrel cage based on the winding function theory

In this paper a method for simulating an axial-flux induction machine with squirrel cage is presented. The Simulation is based on the multiple coupled circuit theory wherein the needed inductances are calculated with the winding function theory. This simulation model is the basis for fault simulations like short circuits. First, the principle arrangement and the machine data are shown. After a short introduction to the winding function and multiple circuit theory the calculation of the self- and mutual- inductances based on its Fourier series is explained. Moreover the difference between using a rectangular and a trapezoidal characteristic of the winding function is described. Especially for this type of machine the needed assumptions and simplifications are presented as well. In a next step the simulation model implemented in Matlab/Simulink is presented. The paper ends with some simulation results compared to the machine data and a short conclusion.