Analytical calculation of the switched reluctance motor's unaligned inductance

This paper develops an analytical model for the unaligned inductance of the switched reluctance motor. The analytical model is useful as long as the m achine's stator and rotor poles do not overlap and its iron does not satura te, Iron saturation is almost never experienced when the rotor is in the un aligned position for practical winding currents. This paper expands on resu lts presented previously to include the contribution to the unaligned induc tance of the flux in both the stator slot and the rotor slot. The approxima tions that are inherent to the analytical model are stated, and a detailed development of the model is provided, Finally, the paper compares predictio ns of the unaligned inductance computed by the analytical model to those ob tained by finite-element analysis for three different machines with differe nt pole counts and rotor diameters.