Comparative study of the magnetic stiffness, levitation and guidance force properties of single and multi seeded YBCOs for different HTS–PMG arrangements

Öztürk, K.; Sahin, Ercin; Abdioglu, M.; Kabaer, Mehmet; Çelık, Şükrü; Yanmaz, E.; Küçükömeroğlu, Tevfik

doi:10.1016/j.jallcom.2015.04.142

Cited by 38 publications

(7 citation statements)

References 19 publications

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“…For the gap between 0 and 40mm, two trends can be observed. One is that the smaller the gap, the larger the flux density, consistent with the results of the literature [12][13][14]. The other is that the rate of decreasing of the magnetic flux density reduces as the gap increases.…”

Section: Field Strength Of Magnets Versus Gapsupporting

confidence: 89%

Removing metal debris from thermosetting EMC powders by Nd-Fe-B permanent magnets

2017

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During the preparation of thermosetting encapsulation molding compounds (EMCs) for semiconductor packaging, metal debris are always present in the EMC powders due to the hard silica fillers in the compound. These metal debris in the EMC powders will cause circuit shortage and therefore have to be removed before molding. In this study, Nd-Fe-B permanent magnets are used to remove these debris. The results show that the metal debris can be removed effectively as the rate of accumulation of the metal debris increases as time proceeds in the removing operation. The removal effectiveness of the debris is affected by both the magnetic flux density and the flow around the magnet. The wake flow behind the magnet is a relatively low speed recirculation region which facilities the attraction of metal debris in the powders. Thus, the largest amount of the accumulated EMC powders occurs downstream of the magnet. Hence, this low speed recirculation region should be better utilized to enhance the removal efficiency of the metal debris.

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Section: Field Strength Of Magnets Versus Gapsupporting

confidence: 89%

Removing metal debris from thermosetting EMC powders by Nd-Fe-B permanent magnets

2017

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“…14 In the most measurements of the magnetic stiffness, the size of minor loop was 1 or 2 mm. [14][15][16][17] The average magnetic stiffness obtained by the particular minor loop was default to the magnetic stiffness for one point on the major loop in these measurements. But the experimental data obtained by Hull and Cansiz showed that the average stiffness varied monotonically with the sizes of minor loop, and they used the method of extrapolating to zero traverse to gain the magnetic stiffness.…”

Section: Introductionmentioning

confidence: 99%

Minor loop dependence of the magnetic forces and stiffness in a PM-HTS levitation system

Yang

2017

AIP Advances

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Numerical investigation of the relationship between magnetic stiffness and minor loop size in the HTS levitation system AIP Advances 7, 105327 (2017); https://doi.org/10.1063/1.5002890Influence of movement direction on levitation performance and energy dissipation in a superconducting maglev system AIP Advances 7, 115305 (2017); https://doi.org/10.1063/1.5002768Method for solution of the interaction between superconductor and permanent magnet

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“…It has been used in many industrial systems including high-speed maglev trains, frictionless bearings, electromagnetic cranes, levitation of wind tunnel models, vibration isolation of sensitive machinery, levitation of molten metal in induction furnaces, rocket-guiding projects, levitation of metal slabs during manufacture and highprecision positioning of wafers in photolithography. [1][2][3][4][5][6][7][8][9] This technology is capable of serving reliable and highspeed operations with the use of feedback controllers. On the other hand, it is difficult to provide a high control performance with standard controllers for the magnetic levitation systems because of their open-loop unstable and highly nonlinear dynamics, and the existence of parameter uncertainties originated by the inductance of the electromagnetic coil.…”

Section: Introductionmentioning

confidence: 99%

Cascade sliding mode–based robust tracking control of a magnetic levitation system

Eroğlu

Ablay

2016

Proceedings of the Institution of Mechanical Engineers, Part I:

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Magnetic levitation systems are able to provide frictionless, reliable, fast and economical operations in wide-range applications. The effectiveness and applicability of these systems require precise feedback control designs because the magnetic levitation is an unstable process and have highly nonlinear dynamics. In this article, a robust sliding mode–based cascade control approach is proposed for effectively tracking the reference position of a magnetic levitation system. The magnetic levitation plant is described with electrical and mechanical models, and the control problems of these parts are treated with cascade controllers. An integral sliding mode and an output feedback sliding mode controllers are designed for use in the cascade loops. The performance of the sliding mode controllers is compared with a proportional–integral–velocity plus proportional–integral control structure. It is shown that the proposed control structure is able to provide a highly satisfactory tracking performance and can eliminate the effects of the inductance-related uncertainties and operating point originated disturbances. The experimental results are provided to validate the efficacy and feasibility of the approach.

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Comparative study of the magnetic stiffness, levitation and guidance force properties of single and multi seeded YBCOs for different HTS–PMG arrangements

Cited by 38 publications

References 19 publications

Removing metal debris from thermosetting EMC powders by Nd-Fe-B permanent magnets

Removing metal debris from thermosetting EMC powders by Nd-Fe-B permanent magnets

Minor loop dependence of the magnetic forces and stiffness in a PM-HTS levitation system

Cascade sliding mode–based robust tracking control of a magnetic levitation system

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