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An Experimental Comparison between an Ironless and a Traditional Permanent Magnet Linear Generator for Wave Energy Conversion

Author

Listed:
  • Domenico Curto

    (Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy)

  • Vincenzo Franzitta

    (Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy)

  • Andrea Guercio

    (Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy)

  • Rosario Miceli

    (Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy)

  • Claudio Nevoloso

    (Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy)

  • Francesco Maria Raimondi

    (Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy)

  • Marco Trapanese

    (Department of Engineering, University of Palermo, Viale delle Scienze, Parco d’Orleans, 90128 Palermo, Italy)

Abstract

Permanent Magnet Linear Generators (PMLGs) are currently being studied for sea wave energy harvesting. Typically, a PMLG consists of an iron-made armature and a moving translator. The permanent magnets adoption produces parasitic effects, such as cogging force, and the machine weight increment. A solution could be the adoption of an ironless configuration, accepting a power density reduction. This paper investigates the use of ironless PMLGs in sea wave energy conversion systems by an experimental comparative analysis between an iron PMLG prototype and an ironless PMLG prototype, which share the same geometry. The main electrical and mechanical parameters (resistance, mass, and magnetic fields) were preliminarily measured. Subsequently, open-circuit and load tests were carried out to compare the induced voltages, the energy transferred to a resistive load, efficiency and the load average power. The reported comparison shows that iron PMLG performances are significantly superior to the ironless ones during the open-circuit tests, as expected. However, the analysis carried out through the load tests shows that the cogging force significantly limits the energy production, obtaining similar values in both machines. Therefore, the experimental tests justify the use of ironless machines in sea wave energy harvesting, where the maximization of energy production is a relevant target.

Suggested Citation

  • Domenico Curto & Vincenzo Franzitta & Andrea Guercio & Rosario Miceli & Claudio Nevoloso & Francesco Maria Raimondi & Marco Trapanese, 2022. "An Experimental Comparison between an Ironless and a Traditional Permanent Magnet Linear Generator for Wave Energy Conversion," Energies, MDPI, vol. 15(7), pages 1-21, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:7:p:2387-:d:778843
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    References listed on IDEAS

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    1. Venugopalan Kurupath & Rickard Ekström & Mats Leijon, 2013. "Optimal Constant DC Link Voltage Operation of a Wave Energy Converter," Energies, MDPI, vol. 6(4), pages 1-14, April.
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    5. Mohamed Derbeli & Cristian Napole & Oscar Barambones & Jesus Sanchez & Isidro Calvo & Pablo Fernández-Bustamante, 2021. "Maximum Power Point Tracking Techniques for Photovoltaic Panel: A Review and Experimental Applications," Energies, MDPI, vol. 14(22), pages 1-31, November.
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    7. Domenico Curto & Vincenzo Franzitta & Andrea Guercio, 2021. "Sea Wave Energy. A Review of the Current Technologies and Perspectives," Energies, MDPI, vol. 14(20), pages 1-31, October.
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    Cited by:

    1. Li, Jian & Zuo, Zhengxing & Jia, Boru & Feng, Huihua & Mei, Bingang & Smallbone, Andrew & Roskilly, Anthony Paul, 2024. "Operating characteristics and design parameter optimization of permanent magnet linear generator applied to free-piston energy converter," Energy, Elsevier, vol. 287(C).
    2. Nick J. Baker & Ahmed Almoraya & Mohammad A. H. Raihan & Steve McDonald & Luke McNabb, 2022. "Development and Wave Tank Demonstration of a Fully Controlled Permanent Magnet Drive for a Heaving Wave Energy Converter," Energies, MDPI, vol. 15(13), pages 1-21, June.

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