Characteristics of Exciting Superconducting Magnet by Magnetic Flux Pump.

Tsukiji, Hiroshi; Hoshino, Tsutomu; Muta, Itsuya

doi:10.1541/ieejias.116.183

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…The heat equation is expressed as [13] (4) where is the heat conduction, is the net function of heat generated by electromagnetic field and is the change in energy stored. The is described by Fourier's law of heat conduction and is given by (5) Therefore, the heat transfer in a solid material is expressed by a partial difference equation as follows (6) where is the thermal conductivity, is the specific heat capacity, is the mass density and is the heat generation rate per unit volume, and is the unknown temperature distribution that is to be determined. The physical properties of the NdFeB permanent magnet and superconductor are referred as follows [11], [14] (Tables I and II).…”

Section: B Thermal Analysismentioning

confidence: 99%

Theoretical Analysis and Design Consideration of Advanced Linear Type Magnetic Flux Pump

Chung

Kang

Yoon

et al. 2011

IEEE Trans. Appl. Supercond.

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As a current compensator, we already developed a linear type magnetic flux pump (LTMFP) that is comprised of DC coils, three phase armature coils, an LTS Nb foil and laminated linear slots. The LTMFP produced a homopolar traveling magnetic field with DC bias current and 3-phase armature current and then, a pumping current is generated in the closed superconducting loop. In this study, we have proposed an advanced LTMFP which can easily produce homopolar traveling magnetic field with the combination of a permanent magnet and the AC armature current. Since the permanent magnets have replaced DC coils in the system, its structure and operation are simplified. As well as, the heating loss of the advanced LTMFP is reduced due to the permanent magnet compared with the LTMFP. From this reason, we confirmed that the advanced LTMFP has more simplified and efficient operation compared with already developed magnetic flux pumps. This paper describes the structure and operating principle of the advanced LTMFP. As well as, the distributions of electromagnetic-thermal analysis of the LTS Nb foil were calculated based on the finite element method (FEM). Thus, in order to realize the homopolar traveling magnetic field, appropriately designing parameters of the combination of AC current and the permanent magnet were obtained.Index Terms-Advanced linear type magnetic flux pump, electro-thermal analysis, homopolar traveling magnetic field, LTS Nb foil, permanent magnet.

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Section: B Thermal Analysismentioning

confidence: 99%

Theoretical Analysis and Design Consideration of Advanced Linear Type Magnetic Flux Pump

Chung

Kang

Yoon

et al. 2011

IEEE Trans. Appl. Supercond.

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“…Magnetic flux pump is a kind of special power supply equipment used to compensate for the operating current decay in the HTS magnet [3]- [5]. The flux pump may pump magnetic flux into superconducting closed loop so as to ensure the stabilization of the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

A control method of excitation winding magnetization for a novel HTS magnetic flux pump

Chen

2011

2011 Chinese Control and Decision Conference (CCDC)

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The main purpose of magnetic flux pump is to stabilize magnetic field of superconducting magnets. This paper chiefly presents a kind of control method to magnetize excitation winding and control system design for a novel high temperature superconducting(HTS) magnetic flux pump. The basic structure and operation principle of the flux pump is simply described here. According to a stated magnetizing sequence of 7-pairs of magnetic poles, we use a singlechip to control the excitation winding to be magnetized one by one. The whole control system has been designed and developed, and the working performance has been tested. The experimental result shows that by this kind of control method, magnetic flux can be smoothly pumped into the HTS closed loop system, consequently compensate the magnetic field decay and make the HTS magnet operate in persistent current mode.

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“…S UPERCONDUCTING flux pump [1], [2] and superconducting rectifier have been proposed and developed for the past about fifty years. Most recently, the application for the superconducting power supply is very promising in highsuperconducting (HTS) coils applications such as magnetic resonance image-CT (MRI-CT) and nuclear magnetic resonance spectrometer (NMR) used for life science fields.…”

Section: Introductionmentioning

confidence: 99%

Performances of a Linear Type Magnetic Flux Pump for Compensating a Little Decremented Persistent Current of HTS Magnets

Chung

Muta

Hoshino

et al. 2004

IEEE Trans. Appl. Supercond.

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This paper describes the characteristics of a linear type magnetic flux pump recently developed. The linear type flux pump has been fabricated to apply to compensate decremented persistent current of HTS applications such as NMR and MRI system. The linear type magnetic flux pump mainly consists of 3-phase AC armature coil, DC bias coil and superconducting Nb foil. In the preliminary experiment, the flux pump can charge the pumping-up current in the load coil of 1.3 mH during 1000 seconds under the DC bias current of 10 A and 3-phase AC of 8 A, 60 Hz. The magnitude of pumping current is 0.1 mA/s. Index Terms-Linear type magnetic flux pump, Nb foil, persistent current compensation.

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Characteristics of Exciting Superconducting Magnet by Magnetic Flux Pump.

Abstract: For exciting superconducting magnets has been used conventional power supply and power leads. This way has some problems: heat leak into the cryogenic part, occurrence of Joule loss in the power leads,

Cited by 10 publications

References 6 publications

Theoretical Analysis and Design Consideration of Advanced Linear Type Magnetic Flux Pump

Theoretical Analysis and Design Consideration of Advanced Linear Type Magnetic Flux Pump

A control method of excitation winding magnetization for a novel HTS magnetic flux pump

Performances of a Linear Type Magnetic Flux Pump for Compensating a Little Decremented Persistent Current of HTS Magnets

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