Harvesting Oceanic Wave Energy by a Linear Generator Using High Graded N28EH Permanent Magnets

Almost all the existing permanent magnets (PMs) used in linear generators to produce electrical energy from sea wave are neodymium iron boron (NdFeB). During electrical power generation, these PMs become gradually heated which significantly degrades the generation of electricity. In this paper, the temperature effect is analyzed for high graded NdFeB PM. It is also analyzed that, high temperature of PMs is the cause of minimization of remanence magnetism which further causes lower amount of electrical power from the linear generator. As a solution of this problem for linear generators, high graded NdFeB N28EH PMs are proposed to use in the linear generator which can maintain its magnetic characteristics even at higher temperature. Simulation results show that, because of using the proposed N28EH PM in the linear generator, it produces more electricity at high temperature than using that of the conventional NdFeB PMs.