Design and optimisation of transverse flux machine with passive rotor and flux-concentrating structure

This paper proposes a transverse flux machine which has the topology of flux-concentrating and passive rotor, and also conducts a design and optimisation for machine. With working process of the machine introduced, its topology structure and composition are introduced. The optimisation objectives and design parameters are obtained with analysis. Furthermore, the performance equations are deduced to determine the parameters which affect performance. Ten free parameters should be optimised and the number of pole pair is first optimised with preliminary simulation. Subsequently, Taguchi method is applied to reduce the number of free parameters, and four parameters are selected to be further optimised. Three approximation models are created, and the Kriging model is better to predict the simulation results, thereby substitute the simulation to be used to algorithm. Accordingly, NSGA-II and MOPSO are used to acquire the optimal design for the machine, and the best solution of algorithm is determined by the simulation based on the results from the two algorithms. Finally, the prototype experiment is conducted to verify the optimisation method and simulation. The whole optimisation process for design and optimisation of electrical machine which is timesaving in comparison with optimisation with only simulation can provide the reference for electrical machine's design.