This paper proposes an air-cored 3-phase tubular permanent magnet linear generator(3P-TPMLG) with a novel structure intended for wave power generation. First, the concrete construction and initial dimensions of the 3P-TPMLG are given through design principles and experience. Second, the basic working principle and the operational process of the mover are discussed according to relevant equations and the isolines distribution of magnetic vector potential at several typical mover positions. Third, the 2-D and 3-D machine models established by finite element analysis (FEA) software FLUX and electromagnetic field analysis are presented. Furthermore, two pivotal parameters are optimized to improve operating conditions and output performance of 3P-TPMLG. Finally, output parameters of 3P-TPMLG are solved separately by FLUX under the constant velocity and the sinusoidal velocity. In accordance with verification by finite element dynamic simulation, 3P-TPMLG has good power output at both constant velocity and sinusoidal velocity. Meanwhile, when the reciprocating frequency is 80 Hz and the proportion of permanent magnet length in half pole pitch is 7/10, the comprehensive evaluation of the generator is optimal. The novel structural 3P-TPMLG for wave power generation can realize symmetrical three-phase power generation when the mover performs reciprocating linear motion at a sinusoidal velocity. Besides, the relative comparisons with other TPMLGs prove that the 3P-TPMLG has the advantages of high efficiency, high power density, and low construction price.

novel structure,tubular permanent magnet linear generator,wave power generation,electromagnetic field analysis,symmetrical three-phase power generation