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Classical and Advanced Controllers for Ideal Halbach Magnetic Lead Screw for Ocean Wave Energy Applications

Author

Listed:
  • Doha Mostafa

    (Department of Electrical Engineering, College of Engineering and Petroleum, Kuwait University, P.O. Box 5969, Safat, Kuwait City 13060, Kuwait)

  • Mohamed Zribi

    (Department of Electrical Engineering, College of Engineering and Petroleum, Kuwait University, P.O. Box 5969, Safat, Kuwait City 13060, Kuwait)

  • Hussain A. Hussain

    (Department of Electrical Engineering, College of Engineering and Petroleum, Kuwait University, P.O. Box 5969, Safat, Kuwait City 13060, Kuwait)

Abstract

A magnetic lead screw (MLS) uses the magnetic field of permanent magnets to convert between linear and rotational motions while achieving a gearing action. This mechanism converts low-speed, high-force linear motion to high-speed, low-torque rotational motion. The MLS is ideal for wave energy applications, where the low-speed oscillatory motion of waves can be converted into usable electrical energy. It harnesses the high-force, low-speed linear motion of waves and converts it into rotational motion for generators, all while maintaining contact-free power transfer, reducing maintenance and machine size compared to linear machines. In this study, two controllers are proposed for an ideal Halbach magnetic lead screw: a proportional-resonant (PR) controller and an observer-based state feedback controller (O-SFC). The proportional-integral (PI) controller is also presented as a benchmark. These controllers are developed based on the linearized model of the ideal Halbach MLS and validated through simulation studies of its non-linear model. Results show that both the PR and O-SFC controllers significantly improve system performance compared to the PI controller, with the O-SFC providing superior performance over both the PR and PI controllers.

Suggested Citation

  • Doha Mostafa & Mohamed Zribi & Hussain A. Hussain, 2025. "Classical and Advanced Controllers for Ideal Halbach Magnetic Lead Screw for Ocean Wave Energy Applications," Energies, MDPI, vol. 18(6), pages 1-18, March.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:6:p:1447-:d:1613095
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    References listed on IDEAS

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    1. Lixun Zhu & Chao Ma & Wei Li, 2022. "A Novel Structure of Electromagnetic Lead Screw for Wave Energy Converter," Energies, MDPI, vol. 15(8), pages 1-12, April.
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