End ring inductance of a squirrel-cage induction motor using 2D and 3D finite element methods

The paper describes the calculation of the inductance of the end ring of a squirrel-cage induction motor using finite elements. The inductance values are obtained using 2D and 3D finite elements and the results are compared with an analytical solution. The ring inductance is split into a leakage component and a mutual component describing the coupling between end ring and end winding. The variation of both components at different load situations is described. It is shown that the ring inductance has significant influence at the locked rotor. This influence is shown by calculations of the locked rotor current with and without inclusion of the end ring inductance using a 2D finite element method. Comparisons with measurements are given