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To solve the low power density disadvantage of direct-drive wave energy converter, caused by low direct-drive speed. A novel linear tubular field modulated permanent magnet generator is proposed, which can effectively improve the performance of this kind of generators. The operation of the proposed generator is analyzed. The generator performance is evaluated using finite element method. The results...
An Outer-PM tubular linear generator has been designed to increase the power density and distance of relative movement. The design of the two buoys has been completed. Detailed design process of the proposed generator is described. Considering the cogging force and voltage, the linear generator has been optimized and final parameters have been determined. The integrated wave converter system has been...
To solve the problem caused by the heavily axial gravity load of the rotor and main shaft of the hydraulic generators, a superconducting induction magnetic levitation device is proposed for hydraulic generator system. AC superconducting windings are implemented to increase the levitation force. The basic structure and principle are introduced. According to the calculated magnetic field distribution,...
The thermal characteristics of motor relates to the secure operation of electric machine, which is important in the process of improving motor's efficient and working capacity. In this article, the thermal field of a special single-side permanent synchronous linear motor (SPLSM) is researched. A 3-Dimentional (3-D) flow model of the SPLFM's external surfaces is built, the average wind velocities and...
In this paper, a novel flux-switching permanent-magnet linear generator (FSPMLG) is proposed for wave-energy extraction. The 2-D finite-element method (FEM), combined with the equivalent circuit, is implemented to investigate the electromagnetic characteristics of the FSPMLG. The optimal structure of the linear generator has advantages of better voltage waveform and minimal cogging effect. The numerical...
The magnetic fields due to different planar Halbach permanent magnet (PM) array, including the 4 piece square array, stretched 8 piece square array and trapezoid array, are studied by analytic calculation method and FEM. On this basis, the magnetic forces over the magnet weight per array unit area are obtained. Then comparisons of above results indicate that the trapezoid array can provide the maximum...
In this paper, a novel flux-switching permanent magnet (FSPM) linear generator is proposed for wave energy extraction. The linear generator is analyzed by using 2D finite element method (FEM) to investigate the electromagnetic characteristics. The result shows that the proposed generator has advantage of the voltage waveform by reducing the cogging effect. The computational results are verified by...
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