An Overview of Flux Pumps for HTS Coils

Coombs, Tim; Geng, Jianzhao; Fu, Lin; Matsuda, Koichi

doi:10.1109/tasc.2016.2645130

Cited by 42 publications

(37 citation statements)

References 44 publications

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“…In general, there are three main types of HTS flux pumps including traveling wave flux pumps, transformer-rectifier and variable resistance rectifier flux pumps [37]. In recent years, the travelling wave flux pumps have been very popular because of their simplicity, not using any switches and hence less maintenance and cost.…”

Section: Introductionmentioning

confidence: 99%

Modeling of airgap influence on DC voltage generation in a dynamo-type flux pump

Ghabeli

Pardo

2020

Supercond. Sci. Technol.

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Section: Introductionmentioning

confidence: 99%

Modeling of airgap influence on DC voltage generation in a dynamo-type flux pump

Ghabeli

Pardo

2020

Supercond. Sci. Technol.

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“…Flux pumps could improve the efficiency of a degaussing system significantly compared to switched-mode power supplies. However, they operate at a much lower frequency where the attenuation by the hull is also lower [15]. Besides flux pumps and persistent mode current switches, the use of parallel MOSFET's is also a good possibility for an efficient power supply [16].…”

Section: Discussionmentioning

confidence: 99%

“…This can be done by reducing the switching frequency. Flux pumps operate in the range of 1 − 200 Hz [15] and a MOSFET based power supply could have a switching frequency as low as 100 mHz [16]. In this frequency range the attenuation by the hull is not sufficient to reduce the peak of the switching frequency in the magnetic signature and the use of switching frequency modulation may be recommendable.…”

Section: Discussionmentioning

confidence: 99%

Magnetic Signature Reduction by Converter Switching Frequency Modulation in Degaussing Systems

Wikkerink

Mor²,

Polinder

et al. 2022

IEEE Access

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Ships can avoid to be detected by magnetic mines by reducing their magnetic signature with degaussing coils. Degaussing currents are provided by switched mode power supplies which impose a current ripple on top of the degaussing current. The ripple might be visible in the magnetic signature which would increase the detectability of the ship. A way to reduce the ripple in the magnetic field is to use a switching modulation scheme in the degaussing power supplies. In this paper, a magnetic model of a ship with degaussing coils is described. It is used to find the magnitude of the ripple in the magnetic signature. Also the effect of reducing the current ripple by frequency modulation is investigated. Several modulation schemes are modelled. It is found that the ripple in the magnetic signature is often, but not always, negligible due to attenuation by the ship's hull. For low frequency switching applications, like high temperature superconductor degaussing systems, the ripple is visible in the magnetic signature. It is found that switching frequency modulation is a very effective technique to reduce the ripple of degaussing currents. Of the tested schemes, random lead lag and random switching frequency are the most effective.

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“…Transformer-rectifier flux pumps (TRFP) [13]- [15] act as ac current to dc voltage converters. Ac current is induced in a superconducting circuit and rectified into dc voltage across a load coil by using superconducting switching elements.…”

Section: Introductionmentioning

confidence: 99%

Design of a 60 kA Flux Pump for Fusion Toroidal Field Coils

Rice

Geng

Bumby

et al. 2022

IEEE Trans. Appl. Supercond.

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High-temperature superconducting (HTS) magnets offer a novel pathway to magnetically confined fusion energy generation. Reactor-scale fusion devices require tens of kA of current to generate large toroidal fields for magnetic confinement.Operating HTS magnets at kA-current levels is difficult due to unavoidable joint resistances that require active driving of current. The large footprint and energy demand of a solidstate power supply and multi-kA current leads present significant constraints on the size, cost and efficiency of a fusion tokamak. An alternative approach is to use an HTS flux pump, which can generate and sustain persistent currents in HTS coils at the kAlevels required by fusion magnet systems. Here, we outline the design of a 60 kA transformer-rectifier flux pump for energizing and sustaining an 80 mH HTS fusion magnet. The flux pump is driven by an iron-core transformer with copper primary and HTS secondary windings. This is rectified by switching elements in the superconducting circuit into a uni-directional dc voltage output which charges the inductive load. To charge the load coil to 60 kA in 24 hours, an output dc voltage of 55 mV is needed. However, only 6 mV is required to maintain a long-term steady current of 60 kA. Such a device can significantly reduce the cost and footprint of future fusion reactor designs.

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An Overview of Flux Pumps for HTS Coils

Cited by 42 publications

References 44 publications

Modeling of airgap influence on DC voltage generation in a dynamo-type flux pump

Modeling of airgap influence on DC voltage generation in a dynamo-type flux pump

Magnetic Signature Reduction by Converter Switching Frequency Modulation in Degaussing Systems

Design of a 60 kA Flux Pump for Fusion Toroidal Field Coils

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