A Dual-Stack Coaxial Magnetic Gear for a Wave Energy Conversion Generator

Baninajar, Hossein; Modaresahmadi, Sina; Wong, Ho Yin; Bird, Jonathan Z.; Dechant, Bertrand; Southwick, Parker

doi:10.1109/tmag.2022.3199580

Cited by 9 publications

(4 citation statements)

References 35 publications

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“…In addition to the utilization of high-quality magnet material (such as the sintered NdFeB PM with the maximum energy product ranging from 200 to 400 kJ/m 3 ), varying the magnet distribution from ordinary surface radial magnetization to patterns as shown in Figure 3 flux-focusing effect in favour of flux-density increment but also able to cancel or lessen issues regarding centrifugal force and gluing [19][20][21][22][23][24][25][26][27]. Using the Halbach PM array can effectively improve the distribution of air-gap magnetic density, thus weakening torque ripple and reducing core loss [28,29]. A consequent-pole arrangement allows reduction of PM volume without great depression on the torque density [30].…”

Section: Permanent Magnet Distributionmentioning

confidence: 99%

“…For instances, adoption of the spoke‐type PM arrangement is not only able to employ the flux‐focusing effect in favour of flux‐density increment but also able to cancel or lessen issues regarding centrifugal force and gluing [19–27]. Using the Halbach PM array can effectively improve the distribution of air‐gap magnetic density, thus weakening torque ripple and reducing core loss [28, 29]. A consequent‐pole arrangement allows reduction of PM volume without great depression on the torque density [30].…”

Section: Development Of the Field‐modulated Magnetic Gearmentioning

confidence: 99%

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A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

Yan,

Li,

Wang

et al. 2023

IET Electric Power Appl

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As a type of magnetic device being able to realize contact‐free power transmission together with sufficient volumetric torque density, the field‐modulated magnetic gear (FMMG) has become a promising alternative to the mechanical gear having rigid construction yet suffering lots of issues generated by the continuous teeth friction. The conventional magnetic gears (MGs) that behave as simple copies of their mechanical counterparts and can be roughly defined as origination of the FMMG are briefly introduced at first. Subsequently, the topology and material advancements proposed to improve operational performance of the FMMG are comprehensively summarised so as to clarify its current development status. Finally, potential applications of the FMMG due to its inherent advantages are compared against the existent challenges. The review aims to provide referable guidelines for researchers working at the field of high‐performance MGs.

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Section: Permanent Magnet Distributionmentioning

confidence: 99%

Section: Development Of the Field‐modulated Magnetic Gearmentioning

confidence: 99%

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

Yan,

Li,

Wang

et al. 2023

IET Electric Power Appl

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“…Due to the general low frequency of waves, direct-driven wave energy conversion is not efficient for power generation. Baninajar et al [30] proposed a dual-stack coaxial magnetic gear to improve the energy output efficiency of a generator and Liu et al [31] proposed a permanent magnet-induction magnetic screw with high thrust density and high energy conversion efficiency to improve the energy conversion efficiency of direct-drive electromagnetic processes. Calvário et al [32] proposed a technique to match the geometric and control parameters of a power take-off (PTO) system for a WEC using a genetic algorithm to increase the excitation torque of the buoy and improve the conversion efficiency of the PTO system.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Buoy Shape for Wave Energy Converter Based on Particle Swarm Algorithm

Ge,

Ji,

Jin

et al. 2024

Applied Sciences

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In order to improve the wave energy capture rate of the buoy of a wave energy generation device, this paper proposes a multi-degree of freedom method to optimize the shape of the buoy with maximum wave energy capture. Firstly, a multi-degree of freedom wave energy converter was designed, and the buoy shape was defined using a B-spline curve to generate the shape vector; then, a numerical model of the multi-degree of freedom wave energy converter was established and numerical calculations were carried out using AQWA/WEC-Sim software; on this basis, the particle swarm optimization algorithm was introduced to find the buoy shape corresponding to the maximum wave energy capture. Finally, the optimization of the buoy shape was in irregular waves. The results show that as the wave energy capture increased, the buoy shape tended to be flatter, with a smaller taper, and the optimal buoy shape had a better motion response than the conventional cone buoy. Eventually, the correctness of the buoy shape optimization method was verified through experimental testing.

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“…Magnetic gear has the characteristics of low noise, no lubrication, no maintenance, inherent overload protection, and so on [1][2][3]. It has a wide range of applications in wind turbines, electric vehicles and other fields [4,5].…”

Section: Introductionmentioning

confidence: 99%

Analytical Model of Air‐Gap Magnetic Field for Eccentric Harmonic Magnetic Gear with Halbach Array

Liu,

Zhang

et al. 2023

IEEJ Transactions Elec Engng

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The eccentric harmonic magnetic gear (EHMG) has the characteristics of high torque density, high transmission ratio and high efficiency. The EHMG with Halbach array has better performance than the EHMG with traditional radial magnetization. Accurate calculation of its air‐gap magnetic field is of great significance for design and optimization. Based on the boundary perturbation method, a 2D analytical model of the air‐gap magnetic field of EHMG with Halbach array is established in this paper. The eccentric air‐gap magnetic field is calculated due to the permanent magnets of the eccentric rotor and the stator acting alone, and then the air‐gap magnetic field of the EHMG is obtained according to the superposition principle. The results of the air‐gap magnetic field are compared and evaluated by the regression evaluation indexes. The analytical results are consistent with the finite element results, which verifies the validity and accuracy of the analytical model. Comparing the EHMG with Halbach array and radial magnetization, the maximum static and dynamic electromagnetic torques of EHMG with Halbach array are increased by 59.1% and 55.6% compared with the EHMG with radial magnetization, which verifies the superior performance of EHMG with Halbach array. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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A Dual-Stack Coaxial Magnetic Gear for a Wave Energy Conversion Generator

Cited by 9 publications

References 35 publications

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

Optimization of Buoy Shape for Wave Energy Converter Based on Particle Swarm Algorithm

Analytical Model of Air‐Gap Magnetic Field for Eccentric Harmonic Magnetic Gear with Halbach Array

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