Design, Construction, and Analysis of a Large-Scale Inner Stator Radial Flux Magnetically Geared Generator for Wave Energy Conversion

Johnson, Matthew; Gardner, Matthew C.; Toliyat, H.A.; Englebretson, Steven; Ouyang, Wen; Tschida, Colin

doi:10.1109/tia.2018.2828383

Cited by 83 publications

(22 citation statements)

References 28 publications

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“…These are the foundations of the comparison between the two generators. The performances of the FMLPMG and LPMSG are analysed and compared by FEM and experiments to confirm the rationality of the FMLPMG design [26].…”

Section: Results Analysismentioning

confidence: 99%

Magnetic field‐modulated linear permanent‐magnet generator for direct‐drive wave energy conversion

Feng

Zhao

et al. 2020

IET Electric Power Applications

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The linear permanent-magnet synchronous generator (LPMSG) for direct-drive wave energy conversion (WEC) suffers from many drawbacks that have not yet been overcome, such as a low power density and a bulky system volume. Therefore, a magnetic field-modulated linear permanent-magnet generator (FMLPMG) with a simple structure has been designed and manufactured. First, the operating principle of the FMLPMG is demonstrated by the equivalent magnetic circuit method, which explains the high power density of the FMLPMG. Second, at a constant speed and a sinusoidal speed, the electromagnetic characteristics of the FMLPMG under the no-load and load conditions are analysed by the finite-element method. Finally, a direct-drive WEC test platform is built to simulate the process of wave action on the FMLPMG. No-load and load experiments of the FMLPMG are conducted on the test platform, and the results are compared with those of an LPMSG with the same volume and operating conditions. The results show that the FMLPMG with a high power density converts wave energy effectively and solves the problem of low power density faced by the LPMSG in direct-drive WEC.

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Section: Results Analysismentioning

confidence: 99%

Magnetic field‐modulated linear permanent‐magnet generator for direct‐drive wave energy conversion

Feng

Zhao

et al. 2020

IET Electric Power Applications

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“…According to 2D FEA the slip torque is reduced by 0.49 Nm which is acceptable. According to [21] the use of an uneven number of segments may result in unbalanced radial forces. This is indeed the case, as an unbalanced radial force on the segment ring of 75 N appears, however, this is low and may be allowable.…”

Section: Cogging Torque and Vibrationsmentioning

confidence: 99%

Conveyor System With a Highly Integrated Permanent Magnet Gear and Motor

Nielsen

Holm

Rasmussen

2020

IEEE Trans. on Ind. Applicat.

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Magnetic gears have attracted increasing attention in recent years due to many possible advantages over mechanical gears. Many papers have been presented with theoretical proof of the basic properties and topologies of the magnetic gears and their parallels to mechanical counterparts, however, very little work has been done to implement the magnetic gears into actual applications which fully utilises their desirable properties. This paper presents a concept study and physical demonstrator of a magnetic gear and permanent magnet machine highly integrated into a drive unit for chain conveyor systems. Several current mechanical gear/motor combinations are replaced by the new drive unit, which is more compact and potentially more energy efficient. Moreover, the inherent overload protection of the magnetic gear eliminates the need for a mechanical slip clutch in the system, further reducing system complexity and improving reliability. An experimentally measured torque density of 142 Nm/l is obtained for the active magnetic gear volume.

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“…Linear PM generators for application in Archimedes Wave Swing (AWS) were explored in [35]- [37]. An approach to design a hermetically sealed MG was evaluated in [38], whereas the use of large-scale inner stator radial flux MGM was brought into consideration in [39]. In [40], Uppalapati et al examined the performance of ferrite magnets in MG for low speed marine power generation.…”

Section: Introductionmentioning

confidence: 99%

Axial-Flux PM Disk Generator With Magnetic Gear for Oceanic Wave Energy Harvesting

et al. 2019

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Magnetic gears (MGs) offer many advantages over mechanical ones due to their contactless mechanism of torque transfer. With the flourish of this new avenue of research, a new breed of MGs has been designed that are well suited to execute high-torque direct-drive operations. This paper investigates the performance characteristic of a disk generator located on the same shaft with an MG for oceanic wave energy harvesting application. The permanent magnets (PMs) of both the generator and the MG are arranged in a special manner to boost the overall performance of the system. To verify the validity of the proposed model, simulations of the magnetic disk gears are performed using Maxwell version 16. The calculation of the magnetic field, and the characteristics of the generator is made using Infolytica Magnet software package. Furthermore, the prototype sample of the generator with the magnetic gear is fabricated and tested in the laboratory, which further substantiates our claim.INDEX TERMS Generator, magnetic gear, oceanic wave energy, permanent magnet, wave energy harvesting, torque density.

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Design, Construction, and Analysis of a Large-Scale Inner Stator Radial Flux Magnetically Geared Generator for Wave Energy Conversion

Cited by 83 publications

References 28 publications

Magnetic field‐modulated linear permanent‐magnet generator for direct‐drive wave energy conversion

Magnetic field‐modulated linear permanent‐magnet generator for direct‐drive wave energy conversion

Conveyor System With a Highly Integrated Permanent Magnet Gear and Motor

Axial-Flux PM Disk Generator With Magnetic Gear for Oceanic Wave Energy Harvesting

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