Comparison and Optimization of a Magnetic Lead Screw Applied in Wave Energy Conversions

Tao Xia*, Junhui Li, Yangfei Zhang, Haitao Yu, Kaiyuan Lu

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


In order to improve the power density of the wave power generation system, a magnetic lead screw (MLS) is introduced in this paper as a speed-increasing device in a wave energy converter (WEC), which converts low-speed linear wave motion to high-speed rotational motion. Then, several types of MLSs with different topologies, which were optimized, are described. Finite element analysis (FEA) was used to investigate and evaluate their electromagnetic performances, such as the thrust force, torque, air gap magnetic density, etc. The optimized MLS prototype was manufactured, and the measurements verify the FEA results. Finally, a magnetic lead screw hybrid generator (MLSHG) for application to the WEC is proposed. This MLS significantly improved the power density under different wave conditions. When the moving speed v = 0.15 m/s, the output power of the MLSHG and outer-PM linear tubular generator were 923 W and 87 W, respectively, when the load resistance was 5 Ω. The output power of the MLSHG was more than 10 times compared to that of the outer-PM linear tubular generator in a fair comparison. Here, it is shown that the power density and output power of were MLSHG increased greatly.

Original languageEnglish
Article number2825
JournalElectronics (Switzerland)
Issue number18
Publication statusPublished - Sept 2022

Bibliographical note

Publisher Copyright:
© 2022 by the authors.


  • finite element analysis
  • magnetic lead screw
  • the thrust characteristics
  • wave power generation


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