Control and Operation of a High Temperature Superconducting Synchronous Motor

Huang, Zhen; Xian, Wei; Zhang, Min; Chudý, Michal; Chen, Y.; Zhong, Zhaoyang; Baghdadi, Mehdi; Wang, Wei; Spaven, F.; Matsuda, Keisuke; Coombs, Tim

doi:10.1109/tasc.2012.2233262

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…Bulk superconductors have proved their significant potential [1][2][3] in comparison to traditional permanent magnets in several engineering applications including magnetic bearings, levitation systems or rotating machines [4][5][6][7][8]. Recently, the investigation on the combination of ferromagnetic (FM) and bulk superconducting (SC) materials in macroscopic SC/FM structures was intensively conducted in order to study the influence of the ferromagnet behaviour on the enhancement of the magnetic properties, in particular the trapped flux density [9,10].…”

Section: Introductionmentioning

confidence: 99%

Magnetic moment and local magnetic induction of superconducting/ferromagnetic structures subjected to crossed fields: experiments on GdBCO and modelling

Fagnard¹,

Morita²,

Nariki³

et al. 2016

Supercond. Sci. Technol.

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Recent studies have shown that ferromagnetic materials can be used together with bulk high temperature superconductors in order to improve their magnetic trapped field. Remarkably, it has also been pointed out that ferromagnets can help in reducing the crossed field effect, namely the magnetization decay that is observed under the application of AC transverse magnetic fields. In this work, we pursue a detailed study of the influence of the geometry of the ferromagnetic part on both trapped fields and crossed field effects. The magnetic properties of the hybrid superconducting / soft ferromagnetic structures are characterized by measuring the magnetic moment with a bespoke magnetometer and the local magnetic field density with Hall probes. The results are interpreted by means of 2D and 3D numerical models yielding the distribution of the superconducting currents as a function of the ferromagnet geometry. We examine in details the distortion of the shielding superconducting currents distribution in hybrid structures subjected to crossed magnetic fields. These results confirm the existence of an optimum thickness of the ferromagnet, which depends on the saturation magnetization of the ferromagnetic material and the current density of the superconductor. A hybrid structure providing an efficient protection against the crossed magnetic field while maintaining the magnetic induction along the axis of the structure is suggested. The limitations of the 2D modelling in this configuration are discussed.

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Section: Introductionmentioning

confidence: 99%

Magnetic moment and local magnetic induction of superconducting/ferromagnetic structures subjected to crossed fields: experiments on GdBCO and modelling

Fagnard¹,

Morita²,

Nariki³

et al. 2016

Supercond. Sci. Technol.

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show abstract

“…The group from Cambridge proposed a fully superconducting motor configuration with HTS bulks in the rotor and HTS coils in the stator [16]. A demonstration device with mixed HTS and copper armature coils was fabricated and tested [17,18]. Advanced Magnet Lab (AML) also proposed a 10 MW fully superconducting wind turbine generator with MgB 2 superconductors on both the rotor and the stator [19].…”

Section: Introductionmentioning

confidence: 99%

Development and testing of a 2.5 kW synchronous generator with a high temperature superconducting stator and permanent magnet rotor

Song

et al. 2014

Supercond. Sci. Technol.

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High temperature superconducting (HTS) armature windings have the potential for increasing the electric loading of a synchronous generator due to their high current transport capacity, which could increase the power density of an HTS rotating machine. In this work, a novel synchronous generator prototype with an HTS stator and permanent magnet rotor has been developed. It has a basic structure of four poles and six slots. The armature winding was constructed from six double-pancake race-track coils with 44 turns each. It was designed to deliver 2.5 kW at 300 rpm. A concentrated winding configuration was proposed, to prevent interference at the ends of adjacent HTS coils. The HTS stator was pressure mounted into a hollow Dewar cooled with liquid nitrogen. The whole stator could be cooled down to around 82 K by conduction cooling. In the preliminary testing, the machine worked properly and could deliver 1.8 kW power when the armature current was 14.4 A. I c for the HTS coils was found to be suppressed due to the influence of the temperature and the leakage field.

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Pulsed field magnetization strategies and the field poles composition in a bulk-type superconducting motor

Huang

Coombs

2017

Physica C: Superconductivity and its Applications

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High temperature superconducting (HTS) bulks o↵er the potential of trapping and maintaining much higher magnetic loading level compared with the conventional permanent magnets used in rotary machines, although the e↵ective magnetization of multiple HTS bulks with di↵erent relative orientations over the surface of cylindrical rotors creates new challenges. In this paper, we present the design and numerical validation of the Pulse Field Magnetization (PFM) strategy considered for the magnetization of the four-pole synchronous fully superconducting motor developed at the University of Cambridge. In a first instance, singular columns of up to five HTS bulks aligned over the height of the rotor were subjected to up to three magnetic pulses of 1.5 T peak, and the experimental results have been simulated by considering the electrical and thermal properties of the system in a 2D approach. The entire active surface of the rotor is covered by HTS bulks of approximately the same dimensions, resulting in an uneven distribution of pole areas with at least one of the poles formed by up to 3 columns of magnetized bulks, with relatively the same peaks of trapped magnetic field. Thus, in order to e↵ectively use the entire area of the superconducting rotor, multiple pulsed fields per column have been applied under the same experimental conditions, what results in about three times larger magnetic pole areas but with an average drop on the peaks of trapped magnetic field of about 50%.

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Control and Operation of a High Temperature Superconducting Synchronous Motor

Cited by 9 publications

References 7 publications

Magnetic moment and local magnetic induction of superconducting/ferromagnetic structures subjected to crossed fields: experiments on GdBCO and modelling

Magnetic moment and local magnetic induction of superconducting/ferromagnetic structures subjected to crossed fields: experiments on GdBCO and modelling

Development and testing of a 2.5 kW synchronous generator with a high temperature superconducting stator and permanent magnet rotor

Pulsed field magnetization strategies and the field poles composition in a bulk-type superconducting motor

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