Design of flux-switching hybrid excitation machine with bypass-bridges

Flux-switching hybrid excitation machine is an interesting brushless machine with magnets and excitation windings in the stator. In order to provide an analytical technique for the flux-switching hybrid excitation machine (FSHM) design, a nonlinear magnetic circuit method (NMCM) of maximum phase flux-linkage position was proposed. With equivalent magnetic circuit model as original version, NMCM adopts the subdivision technology of magnetic circuit and iterative solutions methods, taking magnetic saturation into account. The ampere-turns of electric excitation, the recommended value of initial magnetic bridge flux density, and the influence of stator yoke thickness on magnet dimensions and field regulating coefficient were also investigated. Finally, the finite element analysis and the experimental results are presented. The proposed method provides reference for the assignment for electric excitation and permanent magnet excitation, and the field regulating coefficient.