An Analytical-Numeric Method for Stator End-Coil Leakage Inductance Computation in Multi-Phase Electric Machines

In this paper an analytical-numeric method for stator end-coil leakage inductance computation is presented based on the solution of Neumann integrals. The method extends an approach already introduced for three-phase machines to the case of an arbitrary phase number and arrangement. Moreover, some original contributions are proposed to enhance the calculation of end-coil self inductances, for which Neumann integrals cannot be directly used. Measurements on three machines with different numbers of poles and phases are presented to assess the accuracy of the method.