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Design of Permanent-Magnet Linear Generators with Constant-Torque-Angle Control for Wave Power

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  • Sandra Eriksson

    (Division of Electricity, Uppsala University, SE-751 21 Uppsala, Sweden)

Abstract

This paper presents a simulation method for direct-drive permanent-magnet linear generators designed for wave power. Analytical derivations of power and maximum damping force are performed based on Faraday’s law of induction and circuit equations for constant-torque-angle control. Knowledge of the machine reactance or the load angle is not needed. An aim of the simulation method is to simplify comparison of the maximum damping force, losses, and cost between different generator designs at an early design stage. A parameter study in MATLAB based on the derived equations is performed and the effect of changing different generator parameters is studied. The analytical calculations are verified with finite element method (FEM) simulations and experiments. An important conclusion is that the copper losses and the maximum damping force are mainly dependent on the rated current density and end winding length. The copper losses are inherently large in a slow-moving machine so special consideration should be taken to decrease the end winding length. It is concluded that the design of the generator becomes a trade-off between material cost versus high efficiency and high maximum damping force.

Suggested Citation

  • Sandra Eriksson, 2019. "Design of Permanent-Magnet Linear Generators with Constant-Torque-Angle Control for Wave Power," Energies, MDPI, vol. 12(7), pages 1-19, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:7:p:1312-:d:220334
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    References listed on IDEAS

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    1. Rao, K.S. Rama & Sunderan, T. & Adiris, M. Ref'at, 2017. "Performance and design optimization of two model based wave energy permanent magnet linear generators," Renewable Energy, Elsevier, vol. 101(C), pages 196-203.
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    3. Waters, Rafael & Engström, Jens & Isberg, Jan & Leijon, Mats, 2009. "Wave climate off the Swedish west coast," Renewable Energy, Elsevier, vol. 34(6), pages 1600-1606.
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    5. Vincenzo Piscopo & Guido Benassai & Renata Della Morte & Antonio Scamardella, 2018. "Cost-Based Design and Selection of Point Absorber Devices for the Mediterranean Sea," Energies, MDPI, vol. 11(4), pages 1-23, April.
    6. Bülow, Fredrik & Eriksson, Sandra & Bernhoff, Hans, 2012. "No-load core loss prediction of PM generator at low electrical frequency," Renewable Energy, Elsevier, vol. 43(C), pages 389-392.
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    Cited by:

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    2. Reza Jafari & Pedram Asef & Mohammad Ardebili & Mohammad Mahdi Derakhshani, 2022. "Linear Permanent Magnet Vernier Generators for Wave Energy Applications: Analysis, Challenges, and Opportunities," Sustainability, MDPI, vol. 14(17), pages 1-35, September.
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    5. Raju Ahamed & Kristoffer McKee & Ian Howard, 2022. "A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems," Sustainability, MDPI, vol. 14(16), pages 1-42, August.

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