Modeling of High-Tc Superconducting Bulk using Different Jc–T Relationships over Dynamic Permanent Magnet Guideway

Ye, Hong; Zheng, Jun; Liao, Hengpei

doi:10.3390/ma12182915

Cited by 16 publications

(4 citation statements)

References 23 publications

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“…J c is also related to the temperature T of the bulk superconductor [34]. We analyze the heat loss inside the bulk superconductor through the following three equations, which are solved in COMSOL using the heat transfer interface [25,26]:…”

Section: Hts-pmg Modelmentioning

confidence: 99%

“…This method can reflect the electromagnetic characteristics of HTS material. In recent years, the H formulation for solving the HTS-PMG model has been popular because of its easy implementation in COMSOL software [23][24][25]. Hong et al [26] studied the dynamic electromagneticthermal effect of the HTS bulk at high speed under different E-J constitutive laws by the H method.…”

Section: Introductionmentioning

confidence: 99%

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Vertical and lateral random vibration of high-temperature superconductor maglev under high-speed operation conditions

Huang

Ye²,

Ke³

et al. 2023

Supercond. Sci. Technol.

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High-temperature superconductor (HTS) maglev system shows a significant potential to be applied to high-speed rail transportation based on its passive stable levitation owning to the coupling between the HTS bulks and permanent magnet guideway (PMG). And as one of the key factors to guarantee the safe and stable operation of HTS maglev, the dynamic characteristics of the HTS bulks reflecting the operation performance of HTS maglev system under high-speed running conditions should be focused on. Therefore, this paper, based on H-formulation, established a finite element model of an HTS-PMG system, and assessed its feasibility by experiments. Moreover, the random free vibration of the HTS bulk caused by guideway random irregularity at high speed is also studied by this validated model. The random vibration characteristics and temperature variation of the HTS bulk at three high speeds (600 km/h, 800 km/h, and 1000 km/h) under vertical vibration, lateral vibration, and vertical-lateral coupling vibration, respectively, are compared. The results show that at high speed, vertical vibration can only cause the fluctuation of levitation height, while lateral vibration and vertical-lateral coupled vibration will affect both lateral offset and levitation height. Compared with the mere vertical or lateral vibration mode, the levitation height attenuation and temperature rise of the coupling vibration mode is greater due to more energy loss caused by magnetic flux motion, but it can be aid in the suppression of the vibration in the vertical and lateral direction. The increase of velocity intensifies the vibration strength of the HTS bulk and increases the fluctuation of the levitation height, lateral offset, and temperature rise. However, the vibration at a certain high speed causes a limited temperature rise and thus a limited influence on the bulk performance, and the HTS bulk is still in the safe operating range at a maximum speed of 1000 km/h. These conclusions are anticipated to provide some references for the future high-speed application of the HTS maglev system.

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Section: Hts-pmg Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vertical and lateral random vibration of high-temperature superconductor maglev under high-speed operation conditions

Huang

Ye²,

Ke³

et al. 2023

Supercond. Sci. Technol.

Self Cite

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“…This is because of the limitation of experimental conditions, the behavior of an HTS maglev vehicle on a curve is simulated by rotating the circular PMG and fixing the HTS bulks. This means that the varying rotational speed can only lead to a lowfrequency change of the alternating magnetic field on the bulk superconductors [31] but not to the centrifugal effect of the HTS bulks. Previous studies have shown that the energy loss of the HTS bulk is independent of frequency at low frequency, and magnetic hysteresis is the major cause [27,32].…”

Section: Influence Of the Mld On Dynamic Guidance Forcementioning

confidence: 99%

Dynamic guidance performance of HTS bulk under varying external magnetic field

Huang¹,

Ye²,

Ke³

et al. 2022

Supercond. Sci. Technol.

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With the unique flux pinning characteristics, high temperature superconducting (HTS) bulk can stably levitate above the permanent magnet guideway (PMG). Moreover, owing to its advantages of environmental protection, frictionless and pollution-free, the HTS maglev has shown significant potential in high-speed rail transit. At present, HTS maglev technology is at a critical moment from laboratory research to engineering application. And among the numerous parameters related to its engineering application, the curve negotiation ability determined by the guidance performance of the HTS bulk superconductors is crucial to the safety and stability of its operation. Thus, in this paper, we experimentally investigated the dynamic guidance force of the HTS bulks under different operational conditions including different rotational speeds, maximum lateral displacement (MLD), field cooling height (FCH), and working height (WH) based on a customized HTS maglev dynamic measurement system (SCML-03). In addition, the dynamic guidance force of HTS bulk under long-time operation was studied. It is concluded that FCH, WH, and MLD are intimately associated with the dynamic guidance performance of the HTS bulk, while the rotational speed of the circular PMG has little influence on it. Namely, to improve the dynamic guidance performance of the HTS bulk, reducing the FCH and increasing the WH properly can be regarded as an effective method. Eventually, this research also verifies the long-term lateral stability of the HTS maglev system during dynamic operation.

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“…Other than the fact that H-formulation should work, there is a very large literature of its successful application to problems in HTS machines modelling. Overall, the H-formulation has been used in studying topics such as: ac loss [86], dynamic resistance [87], pulse magnetisation of bulks [88], demagnetisation of bulks [89], magnetic levitation [90], and many more. A modern review of such H-formulation applications can be found in [91].…”

Section: Why H-formulationmentioning

confidence: 99%

The Physics of the High-Temperature Superconducting Dynamo and No-Insulation Coils

Mataira-Cole¹

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High-Tc superconducting (HTS) dynamos are a fascinating topic as practical engineering research preceded fundamental understanding, a lead then maintained for at least a decade. These devices, counter to expectation, produce a dc voltage where ‘textbook’ electromagnetism would predict a zero dc component. Simply by replacing a normal conducting stator in a standard dynamo with HTS conductor a dc — auto-rectifying — effect is created. This thesis reports my work in uncovering and codifying the underlying mechanism that gives rise to this effect — namely the broken symmetry that is usually present with Ohm’s law. An explanation of the dc voltage then leads to an explanation of the internal resistivity of such devices, which in turn allows more efficient dynamos to be designed, and modelled. The underlying logic of the HTS dynamo mechanism is also sufficiently strong to predict a complimentary electromagnetic device, a semiconducting dynamo, which remains to be experimentally verified. Ultimately, such HTS dynamos could be used to energise powerful HTS magnets. The modelling techniques developed in this thesis also provide insight into the operational behaviour of no-insulation coils (NI coils). Such coils are extremely robust to mechanical, thermal, and electrical stresses and faults. A simple model of such coils is presented that captures their essential physics with enough fidelity to predict shielding and magnetisation currents inherent with HTS conductors and turn-to-turn current flow. These two technologies represent key topics for the future of high field HTS magnet technologies and their supporting systems.

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Modeling of High-Tc Superconducting Bulk using Different Jc–T Relationships over Dynamic Permanent Magnet Guideway

Cited by 16 publications

References 23 publications

Vertical and lateral random vibration of high-temperature superconductor maglev under high-speed operation conditions

Vertical and lateral random vibration of high-temperature superconductor maglev under high-speed operation conditions

Dynamic guidance performance of HTS bulk under varying external magnetic field

The Physics of the High-Temperature Superconducting Dynamo and No-Insulation Coils

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