Comparative Study of the Electromagnetic Performance of Yokeless and Segmented Armature YASA Machine with Different Rotor Pole Combinations

Abstract

In this paper, a conventional axial flux yokeless and segmented armature YASA machine is designed and then simulated. It has been proved that, this machine has a high torque density and has been utilized for wind generation and electric vehicle applications. With 12 stator segments, different rotor pole combinations are designed. To maximize the machine torque, the topology is optimized by means of three-dimensional finite element analysis (3D-FEA). The electromagnetic performance for different pole combinations is then analysed and compared. It has been found that the machine with 16 and 14 rotor poles both have high torques. However, the machine with 14 rotor pole has better torque quality and back EMF compared with the other rotor pole combinations