Design and Analysis of a Double-Sided Tubular Linear Synchronous Generator with Particular Application to Wave-Energy Conversion

The benefits of wave-energy are undisputed, however the most suitable method of energy extraction is. A double-sided tubular permanent magnet linear synchronous generator is presented as a possible solution in direct-drive applications. The proposed topology would resemble a double-sided flat LSM that has been curved to be tubular. Both the stator and translator designs are discussed. A mathematical model of the device is developed to aid in design and analysis. To confirm the accuracy of the model, a demonstrative design is presented and simulated using finite element analysis. The simulation results suggest a suitable level of accuracy in the mathematical model for design and analysis purposes, with the simulated force showing a 1.85% deviation from the calculations. The optimisation of any particular design can also yield significant gains. The demonstrative design itself requires 62.5% of the magnetic material of a similarly rated flat layout, and has a footprint of 63.5% of the flat layout´s footprint, indicating a significant increase in power-density. The final stage in the confirmation of the mathematical model is the construction of a smaller, 5 kN test machine. The challenges peculiar to this layout´s construction are presented, and the options available to designers discussed. This includes a discussion on the use of lamination material and soft magnetic composites for optimal AC performance.