A Two Degree-of-Freedom Rotary-Linear Machine With Transverse-Flux Structure


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This article proposes a two-degree-of-freedom rotary-linear machine with transverse-flux structure. In the proposed machine, the rotary flux and linear flux are naturally decoupled, hence, its linear force and rotary torque can be controlled independently. Unlike the conventional rotary-linear machines with three-dimensional (3-D) flux pattern, the proposed machine with transverse-flux structure can employ circumferentially laminated steel sheets to provide outstanding electromagnetic performance. The topology and operation principle of the proposed machine are introduced, while the naturally decoupled-flux feature is explained by analytical modelling and 3-D finite-element method. A parametric study of pole-pair numbers combination is conducted to obtain the optimal pole-pair numbers in both axial and circumferential directions. The optimal electromagnetic performances are quantitatively compared with other two conventional rotary-linear machines, while an experimental prototype is manufactured to verify the proposed concepts.
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Key words
Decoupled magnetic fields,modular stator structure,rotary-linear machines,stator-permanent-magnet,three-dimensional (3-D) finite-element method
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