Optimisation of BDFM Stator Design Using an Equivalent Circuit Model and a Search Method

This paper presents an iterative method for the stator design optimisation of the Brushless Doubly-Fed Machine (BDFM) based on a per phase equivalent circuit model and a tabu search method. Maximum power output from a frame size 180 BDFM is obtained by optimally dividing the overall electric and magnetic loadings between the stator windings. Parameters of the per phase equivalent circuit are calculated according to geometric dimensions for different designs. The relationship between BDFM power output and the control winding excitation is discussed. Comparisons between the original and optimised stator designs are given with experimental verifications.