Abstract
This study presents a design method of a linear transverse-flux machine with mutually coupled windings aiming at the force ripple optimisation. Considering the three-dimensional (3D) magnetic flux in the proposed machine, a mathematic model based on Maxwell stress tensors is developed to facilitate the optimisation, so that the objectives depending on the selected design parameters can be analytically calculated. In order to reduce the optimisation time of the complex machine, mostly influential design parameters are evaluated by the Taguchi method first. Furthermore, the selected parameters are optimised with the human group optimisation algorithm. The main purpose of the algorithm is to attain the desired electromagnetic force with the minimum force ripple coefficient under the restriction of the overall volume. The proposed optimisation has been applied for a case study, and the final design is compared with that optimised by the genetic algorithm. The results show that the optimal machine design obtained by the proposed method has the lower force ripple coefficient, which is also verified by the 3D finite-element method and experiments.
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