Design and Optimization of Tubular Linear Vernier Generator for Direct Drive Wave Energy Converter

Tubular linear vernier generator keeps the advantages of high efficiency and low cost of primary permanent magnet linear generator, but it has more flux leakage. First of all, a new type of tubular linear vernier generator is proposed in this paper. The permanent magnet is embedded in the primary teeth by horizontal and vertical magnetization, which effectively solves the problem of more magnetic leakage at the end of the generator and puts forward the concept of modularization, which greatly reduces the cogging force by modularization. Secondly, taking no-load back EMF, waveform distortion rate and cogging force as the optimization objectives, the sensitivity analysis of the optimization variables of the generator is carried out, and the optimization variables with significant sensitivity are selected to build the model based on box Behnken. Thirdly, particle swarm optimization algorithm is used to solve the response surface model and generate a set of Pareto solutions, so as to obtain the optimal structural parameters of the generator. Finally, the cogging force, output voltage quality and other performance of the optimized generator are calculated and analyzed based on the two-dimensional finite element method, and the multi-objective optimization based on the response surface model and particle swarm optimization algorithm is verified the effectiveness of the design method based on modularization.