Multi-Physics Analysis of Double Stator Switched Reluctance Machines

This paper presents a multi-physics analysis of a double-stator switched reluctance machine (DSSRM). A three dimensional finite element (FE) model is used to calculate the magnetic field within the machine. The magnetic model of the machine is then used to calculate the required current at various operating points. Effects of current chopping, which are not considered in most of previous structural studies, are taken into account as well. The computed currents are then used in a two dimensional electromagnetic FE to calculate force density in the entirety of the machine. Using a three dimensional structural FE analysis the force densities from the previous step are used to calculate the deformation of the stator frame. Vibration characteristics at different points of machine are obtained and used to formulate a boundary element model for computing acoustic power generator by machine's outer surface. A conventional switched reluctance machine with the same outer diameter, yoke thickness and output power is also modeled and compared to the double-stator switched reluctance machine. Effects of soft switching method is also investigated and the results in terms of emitted acoustic noise are demonstrated.