ELECTROMAGNETIC DESIGN BASED ON HYBRID ANALYTICAL AND 3-D FINITE ELEMENT METHOD FOR NOVEL TWO LAYERS BLDC MACHINE

This paper deals with electromagnetic design and three- dimensional (3-D) magnetic fleld analysis of a novel conflguration brushless DC (BLDC) fleld assisted machine based on a hybrid analytical and 3-D flnite element method (FEM) analysis. The aim of this hybrid design method is improving the accuracy and computation time for presented complex magnetic structure. In this hybrid design methodology obtained primary magnetic and electric characteristics including magnetic ∞ux density, ∞ux linkage and induced Back-EMF proflle for studied conflguration are verifled by 3-D FE computation. Comparison of the calculated magnetic fleld and terminal voltage characteristics by their requested values and obtained values illustrates the conformity of the designed parameters. In this study in order to determine the optimum operation, geometry parameters of the proposed machine are optimized based on multi-objective optimization design and genetic algorithm, and flnally 3-D FEM veriflcation is coupled by boundary integral equation method (BIEM). Additionally, the accuracy of 3-D FE analysis is verifled by comparing the calculated results with the experimental measured values.