Topology Optimization of Rotor Structure in Brushless DC Motor With Concentrated Windings Using Genetic Algorithm Combined With Cluster of Material

This paper proposes a novel topology optimization method for the material distribution of electrical machines using the Genetic algorithm combined with the cluster of material and the cleaning procedure. The cluster of several kinds of material is newly taken into account not only to form the group of iron and the group of air but also to form the group of the
r
-oriented,
x
-oriented and
y
-oriented magnets. Consideration of the
r
-oriented magnet gives a surface permanent magnet type rotor, and consideration of the
x
-oriented and
y
-oriented magnets gives an interior permanent magnet type rotor.