Comparative Analysis and Experimental Verification of a Linear Tubular Generator for Wave Energy Conversion

Xia, Tao; Yu, Haitao; Guo, Rong

doi:10.3390/en11071707

Cited by 11 publications

(7 citation statements)

References 29 publications

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“…This is because of the different contributions along the stator windings for every phase. A resembling imbalance between phases was mentioned in [15]. This difference in magnitude between phases is more prominent when the ratio of the machine length over stroke length is low, as it is for this machine.…”

Section: Buried Topology Without End Region Alterationsmentioning

confidence: 60%

“…One study separates the stator block into sections with two phases in each block to counter the end forces [14]. Another study adds assistant teeth and notes the different magnitudes in phase voltages for windings closer to the stator ends [15]. For a linear Vernier hybrid machine, the force ripple and cogging have been minimized by optimizing the consequent poles, translator poles, and PM width [16].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

End Effects and Geometric Compensation in Linear Permanent Magnet Synchronous Generators with Different Topologies

Sjölund

Frost

Leijon

et al. 2021

Designs

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Electricity production from ocean waves with different solutions is a topic of major research interest. Many of such designs are based on linear generators that inherently introduce end forces. In this paper, detent force using Maxwell Stress Tensor and induced voltage is initially investigated for two different winding patterns for a generator topology with buried magnets in a finite element software. Two ways of overcoming the end forces are further examined: the first method reduces the magnetic flux variations of the translator between stator and air. The second method aims at countering the end forces at both ends for full active stator area. A comparison is then made between buried and surface-mounted topologies for the second end effect compensation method. Both no-load and load conditions are investigated in the comparison. The end effect compensation shows promising results for both topologies. Some clear similarities of the extended stator used to counter the end forces are also apparent, where the stator extensions completely cover the outer poles of both topologies. The results also indicate a longer full active stator area for the buried topology for the same pole-pitch and stroke length, resulting in a higher average voltage for partial stator overlap.

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Section: Buried Topology Without End Region Alterationsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

End Effects and Geometric Compensation in Linear Permanent Magnet Synchronous Generators with Different Topologies

Sjölund

Frost

Leijon

et al. 2021

Designs

View full text Add to dashboard Cite

show abstract

“…The theoretical calculation is performed under ideal conditions, which are the neglects of churn loss, stray loss, linear slides friction, current losses, and hysteresis in HPMLG 37,38 . Therefore, under the precondition of ignoring the above factors, the experimental results are reliable.…”

Section: Resultsmentioning

confidence: 99%

A novel single‐body system for direct‐drive wave energy converter

et al. 2020

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Ocean wave energy has played a key role of the renewable energy. This study presents a novel single-buoy wave energy converter (WEC) with directly driven power takeoff (PTO) system to overcome some difficulties that the PTO system in the conventional single-body direct-drive WEC (DD-WEC) is fully submerged under water and far away from the water surface. A rectangular buoy, a direct-drive PTO system with Halbach permanent magnet linear generator (HPMLG), and slide rails form the chief institutions of the WEC. The translator of the HPMLG is installed on the lateral surface of buoy, and the stator is mounted on the seacoast or the boats and ships. While wave drives the floating buoy to move, a relative movement between the translator and the stator of the HPMLG is caused. Then, the relative movement generates electricity. To explore theoretically its feasibility, the dynamics of the wave and the floating buoy is analyzed in detail. Thus, the structural parameters are analyzed and determined, and load performance is described. Furthermore, the finite element method (FEM) is used to conduct the performance evaluation of the

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“…Tubular machines are commonly applied in many industrial applications, such as cryocoolers, linear compressors, or refrigerators [1][2][3]. Recent research activities for energy harvesting in vehicle suspension systems [4][5][6] or using ocean wave energy [7][8][9] have proposed a new trend for tubular machines. From a design viewpoint, at a particular volume, increasing the output power is very difficult.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Tubular Permanent Magnet Machine Performance Using Dual-Segment Halbach Array

2018

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In this paper, a modification of the dual-segment permanent magnet (PM) Halbach array is investigated to improve the performance of the tubular linear machine, in terms of flux density and output power. Instead of a classical Halbach array with only radial and axial PMs, the proposed model involves the insertion of mig-magnets, which have a magnetized angle shifted from the reference magnetized angles of axial and radial PMs. This structure leads to the elimination of flux leakage and the concentration of flux linkage in middle of the coil; therefore, the output power is increased by 13.2%.

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Comparative Analysis and Experimental Verification of a Linear Tubular Generator for Wave Energy Conversion

Cited by 11 publications

References 29 publications

End Effects and Geometric Compensation in Linear Permanent Magnet Synchronous Generators with Different Topologies

End Effects and Geometric Compensation in Linear Permanent Magnet Synchronous Generators with Different Topologies

A novel single‐body system for direct‐drive wave energy converter

Improvement of Tubular Permanent Magnet Machine Performance Using Dual-Segment Halbach Array

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