Integrated structural and electromagnetic design of direct-drive linear machines for wave energy

Crozier, Richard; Mueller, Markus

doi:10.1049/iet-rpg.2011.0002

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…For the simulations presented here, 20 α n , β n , couples have been used for both heave and surge. This number of terms have been shown to have > 99% accuracy compared with the direct calculation of K(t) from (9).Ḟ…”

Section: Hydrodynamic Modelmentioning

confidence: 88%

“…The derivative of the flux linkage with respect to relative position, in the previous equation, is found by taking the numerical derivative of the polynomial fitted to the look-up table mentioned previously with respect to x R , while holding J constant. Further details of the techniques used here, applied to several other linear generator topologies can be found in [9].…”

Section: Electromechanical Modelmentioning

confidence: 99%

“…The radiation forces are functions of the velocities of the buoy (in heave or surge) at the current and all previous time, and also the shape and mass distribution of the buoy. The radiation forces depend on the function K which is given by (9).…”

Section: Hydrodynamic Modelmentioning

confidence: 99%

“…To reduce the computational time necessary to calculate the radiation force, Prony's method [18,19] is employed to evaluate K(t), by equating (9) to the sum of exponential functions in (10), where α n and β n are determined using WAMIT [17], and have different values for the heave and surge directions. A finite number of these functions provide an approximate result with an accuracy related to the number of terms used in the sum.…”

Section: Hydrodynamic Modelmentioning

confidence: 99%

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Analysis, design and testing of a novel direct‐drive wave energy converter system

Crozier

Bailey

Mueller

et al. 2013

IET Renewable Power Generation

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A coupled electromechanical and hydrodynamic time-domain simulation of a direct-drive generator connected to a heaving buoy for wave energy conversion is presented. The system is based on a novel direct-drive power takeoff unit referred to as snapper. The simulation is based primarily in MATLAB using its built-in ordinary differential equation solvers. These solvers act on the data derived from electromagnetic finite element analysis and from the WAMIT wave interaction simulation software. Test results of a generator prototype for comparison with the electromechanical simulation are presented. Results from wave tank tests of a full system incorporating the power takeoff are also provided for comparison with the hydrodynamic model.

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Section: Hydrodynamic Modelmentioning

confidence: 88%

Section: Electromechanical Modelmentioning

confidence: 99%

Section: Hydrodynamic Modelmentioning

confidence: 99%

Section: Hydrodynamic Modelmentioning

confidence: 99%

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Analysis, design and testing of a novel direct‐drive wave energy converter system

Crozier

Bailey

Mueller

et al. 2013

IET Renewable Power Generation

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“…A three-dimensional diagram and cross section is shown in Fig.3a and b. The magnetic translator will be made from permanent magnet material, as is typically required by synchronous direct drive wave energy conversion systems due to size and weight constraints [6]. The coils are mounted to the stator material symmetrically on either side of the translator to ensure that the z-axis force components cancel.…”

Section: Geometric Structure Of the Planar Generatormentioning

confidence: 99%

A Planar Generator for a Wave Energy Converter

et al. 2019

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This paper presents a permanent magnet planar translational generator which is able to exploit multiple modes of sea wave energy extraction. Linear electrical generators have recently been studied for the exploitation of sea wave energy, but, to the best of our knowledge, no synchronous planar translational generator has been proposed. In this paper, to maximise the energy extraction, we have considered all the potential modes of motion due to wave excitation and included them within the mathematical model of the proposed system. The principle of operation of the generator can be summarized as follows: the moving part (translator) of the generator is driven from the sea waves and induces and EMF on the windings mounted to the armature. The movement of the translator is two dimensional and therefore all the movement modes of the wave, except heave, can be exploited. The proposed mathematical model includes the dynamic equations of the translator and the electric equations of the windings. The coupling parameters (inductances, fluxes etc.) have been determined by FEM analysis. Optimization of the device has been performed by considering both, the parameters of the electromagnetic circuit, and, the parameters associated with the stochastic features of the wave.

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Linear electrical generator topologies for direct‐drive marine wave energy conversion‐ an overview

Faiz

Saberi

2017

IET Renewable Power Generation

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Wave energy is one of the most attractive forms of renewable energy. The reasons include its promising availability, predictability, persistence, and power density. This study focuses on all linear generator designs and technologies which have been used so far in direct-drive wave energy converters (DD-WECs). Currently, linear permanent magnet generators (LPMG) have been proposed as the most advantageous generator system developed for DD-WECs. After a brief description of linear generator based wave energy converters, all proposed state-of-the-art of LPMG topologies available in the literature are discussed and compared in terms of flux path, core type, location of PMs, and etc. In addition, other linear generator technologies such as linear switched reluctance and linear superconducting generators, as an alternative to LPMGs, are reviewed. Finally, based on the surveyed quantitative comparisons performed in previous works, eight major concepts are evaluated in terms of economic and operational aspects.

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Integrated structural and electromagnetic design of direct-drive linear machines for wave energy

Cited by 7 publications

References 9 publications

Analysis, design and testing of a novel direct‐drive wave energy converter system

Analysis, design and testing of a novel direct‐drive wave energy converter system

A Planar Generator for a Wave Energy Converter

Linear electrical generator topologies for direct‐drive marine wave energy conversion‐ an overview

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