Fast and accurate analytical calculation of the unsaturated phase inductance profile of 6/4 switched reluctance machines

摘要

Accurate calculation of the phase inductance profile of switched reluctance machines (SRMs) is of crucial importance in SRM design because it is a key parameter to predict the performance indices such as the torque and core loss. Instead of using the time-consuming finite element analysis (FEA) or the methods that require prior knowledge of magnetic fields from an FEA such as curve fitting and magnetic equivalent circuit (MEC), this paper proposes a fast and accurate analytical approach to determine the unsaturated phase inductance of a 6/4 SRM at arbitrary rotor positions by solving the partial differential equations of magnetic scalar/vector potentials based on Maxwell's equations. Conformal mapping is applied to deal with the non-radial or non-tangential geometric structures when calculating the inductance of the SRM. The agreement between the results of the proposed analytical method and FEA validates the analysis.