Resonant Amplitude Reduction of a Rotor Supported by a Superconducting Magnetic Bearing With an Axial Electromagnet

Sasaki, Hiromu; Yubisui, Yu; Sugiura, Toshihiko

doi:10.1109/tasc.2014.2381883

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…Modelling the multi-DoF levitation force behaviour involves the difficulties in both taking into account of the highly non-linear E-J relation for superconductors and the complex multi-DoF dynamic equations. To simplify the multi-DoF model, the levitation force or the levitation stiffness of SMB is often seen as linearisation approximately [26] or solved analytically [27,28]. The complex multi-DoF dynamic model is mainly focused, which is limited in considering the actual superconducting levitation behaviour, for instance the relaxation and hysteresis behaviour.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the multi‐DoF 3‐D model and levitation behaviour of radial‐type superconducting magnetic bearing

Zhang

et al. 2019

IET Electric Power Applications

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It is crucial to calculate the levitation force and model the levitation behaviour in the designation of superconducting magnetic bearing (SMB). At present, the related research focuses on the single degree of freedom (DoF) levitation behaviour of the SMB independently, for instance the axial or radial levitation force. Practically, the superconducting magnetic levitation is passive levitation at directions of multi-DoF. Additionally, the non-ideal conditions in fabrication, such as the joint effect of superconducting bulks, lead to complex 3-D-induced current distributions which generate the levitation force. There are coupling effects which affect the levitation forces at the directions of different DoFs. This paper investigates the multi-DoF modelling and levitation behaviour of the radial-type SMB. By adopting the Power-law E-J relation, the dependence of conductivity on electric field is derived to define the superconductive material. Then, the software MagNet is employed to establish the 3-D multi-DoF finite element model. Under the external disturbance of the PM rotor with axial constant speed and constant load, the multi-DoF levitation behaviours of radial-type SMB are discussed considering the joint effect of superconducting bulks. It is also obtained that the influence of the revolving speed, the static, and dynamic eccentricity on the axial levitation force. (a) Levitation forces of the 3-DoF motion, (b) Positions of the 3-DoF motion, (c) Speeds of the 3-DoF motion

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Section: Introductionmentioning

confidence: 99%

Investigation on the multi‐DoF 3‐D model and levitation behaviour of radial‐type superconducting magnetic bearing

Zhang

et al. 2019

IET Electric Power Applications

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“…With the advantages of passive self-stabilisation levitation, the radial-type superconducting magnetic bearing (SMB) can be applied in the flywheel energy storage system, high-speed motor and cryogenic liquid pump [1][2][3]. At present, the related work about radial-type SMB mainly focuses on the theoretical modelling and experimental research of axial levitation force characteristics [4][5][6][7][8]. However, very little work has been done in predicting the behaviour of the radial levitation force.…”

Section: Introductionmentioning

confidence: 99%

Simplified calculation for the radial levitation force of radial‐type superconducting magnetic bearing

Zhang

et al. 2018

IET Electric Power Applications

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It is usually difficult to obtain the radial levitation force of the radial-type superconducting magnetic bearing (SMB) due to the massive numerical calculations and the sophisticated experimental measurements. This study presents a method for fast calculating the radial levitation force of radial-type SMB, which is based on the infinitesimal method and the 2D finite-element method. During the modelling, the radial-type SMB is assumed to be composed circumferentially of infinite superconductorpermanent magnet (SC-PM) infinitesimals with shape of rectangular thin slice. The dependence of levitation force for the SC-PM infinitesimal on the air-gap length between the SC stator and the PM rotor can be obtained using the 2D finite-element model established in Cartesian coordinate system. Moreover, a simplified analytical model of calculating radial levitation force is developed based on the infinitesimal method and the circumferential distribution formula of non-uniform air-gap when the PM rotor exhibits radial eccentricity. The results of theoretical calculation and experimental measurement of radial levitation force show a good agreement, which verifies the feasibility of the proposed method. It has the advantages of fastness and easiness, and can be used as a theoretical tool for the design, optimisation and performance prediction of the radial-type SMB.

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A Novel Axial High-Temperature Superconducting Magnetic Bearing With Simple Structure and Large Suspension Force

Tang

Xiao

et al. 2023

IEEE Trans. Appl. Supercond.

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Resonant Amplitude Reduction of a Rotor Supported by a Superconducting Magnetic Bearing With an Axial Electromagnet

Cited by 4 publications

References 8 publications

Investigation on the multi‐DoF 3‐D model and levitation behaviour of radial‐type superconducting magnetic bearing

Investigation on the multi‐DoF 3‐D model and levitation behaviour of radial‐type superconducting magnetic bearing

Simplified calculation for the radial levitation force of radial‐type superconducting magnetic bearing

A Novel Axial High-Temperature Superconducting Magnetic Bearing With Simple Structure and Large Suspension Force

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