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Analytical calculation of the end winding leakage inductance based on the solution of Neumann integrals

This paper presents an analytical technique that can be used for calculating the contribution to the end-winding leakage inductance of a switched reluctance machine due to the current in the end winding itself. It is based on a 3D geometric model of the end winding region. Each coil herein is modelled as a set of serially connected straight filaments. The mutual inductance of the end coils is calculated by the solution of the Neumann integral. By using the method of images the influence of the core iron on the end winding leakage inductance is considered, too. The contribution due to axial leakage of the air-gap field is not focused on in this paper.