Electromagnetic Analysis of Linear-rotary Two-degree-of-freedom Tubular Generator for Wave Power Generation

This paper proposes a novel 12-slot 10-pole linearrotary two-degree-of-freedom (LR-2DoF) tubular generator for wave power generation, which outer stator adopts flux switching structure, middle rotor consists of separated iron cores and PMs, and inner mover is slotted iron core. First, its structure is introduced and the working principle is fully analyzed. Second, the 3-D finite element (FE) model is erected and simulated based on finite element method (FEM) to verify the validity of the proposed motor structure. Finally, several significant structural parameters are optimized in order to obtain the optimal back electromotive force (EMF), power density and efficiency based on former 3-D FE model.