Improved Design-Oriented Analytical Modelling of Switched Reluctance
Machines Based on Fröhlich-Kennelly Equations
Abstract
Early design stages of modern Switched Reluctance Machines (SRMs) are
well-known for demanding the analysis of thousands of candidates. The
need for reducing the computation time is, in turn, fostering the
interest in design-oriented analytical approaches capable to maintain
sufficient accuracy for SRMs featuring different geometries and rated
operating conditions. To this end, this work proposes a novel
design-oriented analytical model that predicts the flux linkage loci,
i.e., a set of curves expressing the phase flux linkage as a function of
both phase current and rotor position, from which the main performance
are attained. The model comprises two main parts, each of them
containing a novel scientific contribution: 1) a new interpolation
technique for the flux loci based on second-order Fröhlich-Kennelly
equations, and 2) an analytical model that caters for the flux linkage
in partial overlap and saturated core conditions. Finally, the model is
validated against Finite Element results of four SRMs, along with the
experimental results of one of them, and its implementation in a design
routine is discussed.