Review of Magnetic Gear Technologies and their Applications in Marine Energy

McGilton, Ben; Markus, Mueller; Alasdair, McDonald

doi:10.1049/cp.2016.0535

Cited by 25 publications

(15 citation statements)

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“…These generators include linear permanent magnet (PM) synchronous generators [2, 3], doubly‐fed linear generators [4], switched reluctance linear generators [5, 6], transverse‐flux PM linear generators [7], linear permanent‐magnet‐assisted synchronous reluctance machines [8], and so on. Since the travelling magnetic field runs at the same low speed as the mover, such linear generators have been adopted with a multi‐pole design and suffer from problems such as large volume, low power density, and low efficiency in direct‐drive WEC systems [9].…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Therefore, the magnetic lead screw (MLS) is considered to have a huge potential to replace the mechanical lead screw in the WEC system [4, 5]. MLS has the same function as the mechanical lead screw [6]. However, because there is an air gap between the translator and rotor, the MLS features the merits of inherent overload protection capability, high force density, no mechanical friction and low maintenance as presented in [7, 8].…”

Section: Introductionmentioning

confidence: 99%

Design and experiment of a magnetic lead screw for the point‐absorbing wave energy conversion system

Zhao

Jiang

et al. 2020

IET Electric Power Applications

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This study introduces a new structure of the magnetic lead screw (MLS) intended for wave energy conversion (WEC) applications. One of the key challenges in the application of MLS technology for wave energy lies in the manufacturing of its complicated ideal helix. Structural simplification and processing technology are quite essential in promoting the development of the magnet screw. This study proposes a new method for shaping the desired ideal helix in a simple way with parallelly magnetised magnets. This simple structure reduces manufacturing complexity while maintaining good force density. The magnets with parallel magnetisation are also easier and cheaper to manufacture than the magnets with radial magnetisation. A prototype is manufactured and tested in the laboratory. In addition, the electromagnetic performance of the new structure is evaluated as compared with the magnet screw with ideal helix using the three‐dimensional finite element analysis, verifying the advantages of the proposed structure.

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“…Mechanical gears, however, are a leading cause of downtime in offshore wind [2] and hydraulic systems increase the complexity of the power take off (PTO) and often have efficiency issues. Alternatively, the use of direct drive machines with fully rated converters has been suggested, removing the O&M issues of mechanical gears [3]. This requires physically large, expensive machines due to the required high pole number and studies have found that there is similar downtime resulting from the fully rated converter [4].…”

Section: Introductionmentioning

confidence: 99%

Investigation into linear generators with integrated magnetic gear for wave energy power take off

McGilton

Almoraya

Raihan

et al. 2019

J. eng.

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Review of Magnetic Gear Technologies and their Applications in Marine Energy

Cited by 25 publications

References 0 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

Design and experiment of a magnetic lead screw for the point‐absorbing wave energy conversion system

Investigation into linear generators with integrated magnetic gear for wave energy power take off

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