Linear consequent pole Halbach array flux reversal machine

Raihan, M. A. H.; Baker, Nick; Smith, K. J.; Almoraya, Ahmed A.

doi:10.1049/joe.2018.8110

Cited by 6 publications

(6 citation statements)

References 11 publications

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“…14 (b)) are capable of improving the thrust density of LPMSMs [129], [142], [157], [161], [162]. This is achieved because, due to their structure the flux leakage is reduced [157], [161], [162], [174].…”

Section: A Thrust Force Densitymentioning

confidence: 99%

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Linear Machines for Long Stroke Applications—A Review

et al. 2020

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This document reviews the current state of the art in the linear machine technology. First, the recent advancements in linear induction, switched reluctance and permanent magnet machines are presented. The ladder slit secondary configuration is identified as an interesting configuration for linear induction machines. In the case of switched reluctance machines, the mutually-coupled configuration has been found to equate the thrust capability of conventional permanent magnet machines. The capabilities of the so called linear primary permanent magnet, viz. switched-flux, flux-reversal, doubly-salient and vernier machines are presented afterwards. A guide of different options to enhance several characteristics of linear machines is also listed. A qualitative comparison of the capabilities of linear primary permanent magnet machines is given later, where linear vernier and switched-flux machines are identified as the most interesting configurations for long stroke applications. In order to demonstrate the validity of the presented comparison, three machines are selected from the literature, and their capabilities are compared under the same conditions to a conventional linear permanent magnet machine. It is found that the flux-reversal machines suffer from a very poor power factor, whereas the thrust capability of both vernier and switched-flux machines is confirmed. However, the overload capability of these machines is found to be substantially lower than the one from the conventional machine. Finally, some different research topics are identified and suggested for each type of machine.

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Section: A Thrust Force Densitymentioning

confidence: 99%

“…Halbach arrays can improve the usage of PMs by concentrating the flux density in one side of the arrays [163], [174], [176], [186]. Moreover, as the flux generated by the magnets is almost completely shielded to a single side, very small yokes or even non-magnetic materials can be used with such configuration [187].…”

Section: A Thrust Force Densitymentioning

confidence: 99%

Linear Machines for Long Stroke Applications—A Review

et al. 2020

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“…The peak‐EMF is achieved at 7 mm, while the peak average force is at 8.5 mm. It has been demonstrated in [13] that, thinner tooth saturates when the rated current is applied, and the thrust force reduces very rapidly compared to the reduction of back‐EMF with the increase of tooth width. So the optimal translator teeth width has been selected as 8.5 mm for maximum force generation.…”

Section: Design and Analysismentioning

confidence: 99%

Development of low translator mass linear Vernier machine for wave energy power take off

Raihan

Baker

Smith

et al. 2019

J. eng.

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“…But, in magnetic gears, because of modulators, it is required to improve the magnetic torque ripples. Earlier studies conducted on PM arrangements, utilising Halbach arrays [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], where PM magnetisations rotate in an array of magnets, creating the magnetic fluxes where vary in a more sinusoidal pattern toward the conventional PM arrays [20][21][22]. In the whole mentioned references, constant magnetisations, derived by division of 360°to the number of pole-pair pieces.…”

Section: Introductionmentioning

confidence: 99%

Design of coaxial magnetic gear utilising a novel permanent magnet Halbach array structure

Mafi

Afjei

Ghaheri

2021

IET Electric Power Appl

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Mechanical gears are constrained due to wear and tear and call for lubrication. A magnetic gear, utilising permanent magnet (PM) arrays, facilitates the mechanical gear roles. It can withstand high-speeds and large loads with zero friction. The magnetic gear is more efficacious on account of the least noise, performance, overload protection, and physical isolation between parts than conventional mechanical gears. The quantity of PMs in magnetic structures plays a principal role in its total price, which necessitates optimal arrangements for PMs. Halbach array provides a bigger torque density according to its one-sided flux. In this research, proposing a novel Halbach array structure, leads to intensification in the one-sided flux in a much sinusoidally waveform that consequently increases the magnetic torque. These all lead to gain higher torques in constant volumes of magnets. Besides, the magnetic torque ripple and the modulators' losses are decremented. The new model is based on the variation of the magnetisation angles of the adjacent permanent magnet blocks, in the array. Various states of the magnetisation angles in the array are optimised based on a heuristic method. This is studied in the whole trigonometric range for magnetisation angles characteristics. The prototype is fabricated based on the optimised magnetic gear design and complies with the results. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

show abstract

Linear consequent pole Halbach array flux reversal machine

Cited by 6 publications

References 11 publications

Linear Machines for Long Stroke Applications—A Review

Linear Machines for Long Stroke Applications—A Review

Development of low translator mass linear Vernier machine for wave energy power take off

Design of coaxial magnetic gear utilising a novel permanent magnet Halbach array structure

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