2D Modeling of Litz Wire Reduced Model and its Application for Switched Reluctance Machine

The strong correlation between the level of eddy current losses and the winding geometry shows all the necessity of special attention to the manner of disposition of coils in machine slots and to the wire type whether it’s solid or stranded conductor. Since the transposition of winding strands is a recommended solution to reduce eddy current losses, this article suggests an electromagnetic analysis of complex stranded conductors such as litz wire (LW). It is based on a 2D finite element (FE) model. A model reduction is also proposed. It allows benefiting from only one complete FE solution to find fast solutions in the slots domains when any variation of geometrical or physical data occurred. It allows different problem adapted meshes. Seeing that it prevents the Newton-Raphson iterations, the reduction model presents clear interests in repetitive analysis such as winding optimization processes.