Influence of Winding's Active Parts on Axial Flux in AC Machines

This paper discusses the conditions for generating axial flux using the active parts of stator and rotor windings in AC machines even if these parts are axially located. The 1D flux density analysis of the air gap shows that the axial flux is generated due to the asymmetry of windings or asymmetry of the air gap. Respective conditions are stated and an analytical formula for the axial flux is presented in the paper. Exemplary, the axial flux due to static rotor eccentricity is analyzed in detail.