Numerical analysis and finite element modelling of an HTS synchronous motor

Ainslie, Mark; Jiang, Yu; Xian, Wei; Hong, Zhiyong; Yuan, Weijia; Pei, Ruilin; Flack, T.J.; Coombs, Tim

doi:10.1016/j.physc.2010.05.200

Cited by 43 publications

(38 citation statements)

References 16 publications

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“…1) Rotating Machines: In an ac synchronous machine, superconducting coils can either be used as armature coils or rotor coils. If used as stator coils, superconductors will carry an ac current and will be exposed to a rotating field, thus producing large ac losses [304], [305], [306]. If used as the rotor coils, the magnetic field of the superconducting coils is phase-locked with the stator field.…”

Section: Electrical Power Applicationsmentioning

confidence: 99%

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Grilli

Pardo

Stenvall

et al. 2014

IEEE Trans. Appl. Supercond.

305

272

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Numerical modeling of superconductors is widely recognized as a powerful tool for interpreting experimental results, understanding physical mechanisms and predicting the performance of high-temperature superconductor (HTS) tapes, wires and devices. This is especially true for ac loss calculation, since a sufficiently low ac loss value is imperative to make these materials attractive for commercialization. In recent years, a large variety of numerical models, based on different techniques and implementations, have been proposed by researchers around the world, with the purpose of being able to estimate ac losses in HTSs quickly and accurately. This article presents a literature review of the methods for computing ac losses in HTS tapes, wires and devices. Technical superconductors have a relatively complex geometry (filaments, which might be twisted or transposed, or layers) and consist of different materials. As a result, different loss contributions exist. In this paper, we describe the ways of computing such loss contributions, which include hysteresis losses, eddy current losses, coupling losses, and losses in ferromagnetic materials. We also provide an estimation of the losses occurring in a variety of power applications.

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Section: Electrical Power Applicationsmentioning

confidence: 99%

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Grilli

Pardo

Stenvall

et al. 2014

IEEE Trans. Appl. Supercond.

305

272

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“…The ability to accurately predict the electromagnetic behaviour of superconductors in complex geometries is crucial to the design of commercially-viable superconductor-based electrical devices, such as power transmission cables, superconducting fault current limiters, transformers, and motors and generators. In a superconducting electric machine, in particular, the superconducting coils operate in a rather complex electromagnetic environment [1], [2]. This also allows investigation of the performance of coils acting as HTS insert coils in high-field magnets [3], for example.…”

Section: Introductionmentioning

confidence: 99%

Simulating the In-Field AC and DC Performance of High-Temperature Superconducting Coils

Ainslie

Zeng

et al. 2015

IEEE Trans. Appl. Supercond.

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In this paper, the authors investigate numerically the in-field behaviour of high-temperature superconducting (HTS) coils and a method to potentially improve their performance using ferromagnetic material as a flux diverter. The ability to accurately predict the electromagnetic behaviour of superconductors in complex geometries and electromagnetic environments is crucial to the design of commercially-viable superconductor-based electrical devices, such as power transmission cables, superconducting fault current limiters, transformers, and motors and generators. The analysis is carried out using a two-dimensional (2D) axisymmetric model of a circular pancake coil based on the H-formulation and implemented in Comsol Multiphysics 4.3a. We explore the use of flux diverters to improve an HTS coil's performance with respect to its DC (maximum allowable/critical current) and AC (AC loss) characteristics, for various background magnetic fields. It is found that while flux diverters can improve the AC properties of coils, they can be detrimental to the DC properties in this particular configuration.

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“…Similar to our previous study, stacked coils with different layers of substrate and normal materials were represented by continuous area bulk approximation [7,8], which can efficiently improve simulation and speed model convergence [9,10]. The Physics function Pointwise constraint from general PDE model was used to inject transport current into the HTS coils, which forced the multiplication of the transport current I s with number of turns N equal to the integration of current density J s within bulk approximation over cross-section area A:…”

Section: Superconducting Halbach Arrray Designmentioning

confidence: 96%

Optimization study on the magnetic field of superconducting Halbach Array magnet

Shen

Geng

et al. 2017

Physica C: Superconductivity and its Applications

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This paper presents the optimization on the strength and homogeneity of magnetic field from superconducting Halbach Array magnet. Conventional Halbach Array uses a special arrangement of permanent magnets which can generate homogeneous magnetic field. Superconducting Halbach Array utilizes High Temperature Superconductor (HTS) to construct an electromagnet to work below its critical temperature, which performs equivalently to the permanent magnet based Halbach Array. The simulations of superconducting Halbach Array were carried out using H-formulation based on Bdependent critical current density and bulk approximation, with the FEM platform COMSOL Multiphysics. The optimization focused on the coils' location, as well as the geometry and numbers of coils on the premise of maintaining the total amount of superconductor. Results show Halbach Array configuration based superconducting magnet is able to generate the magnetic field with intensity over 1 Tesla and improved homogeneity using proper optimization methods. Mathematical relation of these optimization parameters with the intensity and homogeneity of magnetic field was developed.

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Numerical analysis and finite element modelling of an HTS synchronous motor

Cited by 43 publications

References 16 publications

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Simulating the In-Field AC and DC Performance of High-Temperature Superconducting Coils

Optimization study on the magnetic field of superconducting Halbach Array magnet

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