Refine design parameters for permanent magnet shape modification of the direct-drive generator

Noor Syazana Abd Ghani, Taib Ibrahim, Nursyarizal Mohd Nor


The high cost associated with operation has promoted the progress of wave energy conversion and has higher power output and larger size. However, many countries are bordered by the sea, and the possible area for using wave energy is very small. It can be used to generate peak power generation systems with a power output of less than 100W to facilitate outdoor activities application. The purpose of this article is to introduce the refined parameters of the new design of the permanent magnet shape of the tubular longitudinal direct-drive generator focusing on the conversion of wave energy. Three designs proposed, which different shapes of permanent magnets with the same topology. The parameter optimization process was analyzed using finite element analysis to determine the best main parameters of the design, namely the length of the stator length to translation ratio (Ls / Lr), pitch ratio (Tmr / Tp), and split ratio (Rm / Re). To evaluate design performance, electrical losses from the proposed design were also evaluated. The optimization results show that these designs generator can produce 100W of peak level output power with higher efficiency at rated current and optimal load.


linear generator; permanent magnet; refine parameter design; wave energy converter; wave power



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