Dynamic characteristics of a high-<i>T</i>
                  <i>c</i> superconducting bearing with a set of alternating-polarity magnets

Komori, Mochimitsu; Matsushita, Teruo; Fukata, Satoru; Tsuruta, Akito; Ide, Takahiko

doi:10.1063/1.359016

Cited by 15 publications

(3 citation statements)

References 12 publications

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“…Due to the flux pinning property, bulk high-temperature superconductors (HTSs) can stably levitate above a permanent magnetic guideway (PMG) [1]. This property is used for flywheel energy storage [2], HTS bearings [3] and maglev vehicles. Several vehicle prototypes have been successfully developed in the last 20 years [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Modeling and identification of the hysteresis nonlinear levitation force in HTS maglev systems

Liu

et al. 2020

Supercond. Sci. Technol.

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High-temperature superconducting (HTS) maglev has great potential in the field of high-speed transportation due to its capability for passive stabilization. The levitation force between the bulk HTSs and the permanent magnet guideway is a significant parameter relating to operational safety and comfort. This force has an obvious hysteresis nonlinear characteristic, which can be represented by nonlinear stiffness and damping. The stiffness and the damping are functions of vertical displacement and velocity, respectively. The vibration velocity of a HTS maglev vehicle can at times exceed 100 mm s−1, but the existing levitation force test methods are almost quasi-static. These methods are unable to accurately measure the damping characteristic of the maglev system. In this paper, a viscoelasticity model is introduced to describe the dynamic force. The parameters in the model are identified using the least square method based on the vibration response of the HTS maglev system. Meanwhile, the effectiveness of the model and identification method are tested by numerical simulations. The hysteresis loops derived from the motion theory coincide with the practical ones. Finally, the method is applied to identify the parameters of hysteresis nonlinear levitation force in a previous experiment with dampers. Based on the established hysteretic model, the dynamic characteristics of the HTS maglev system can be well presented.

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Section: Introductionmentioning

confidence: 99%

Modeling and identification of the hysteresis nonlinear levitation force in HTS maglev systems

Liu

et al. 2020

Supercond. Sci. Technol.

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“…Some reports of dynamic characteristics that bulk HTSC in the axisymmetric magnetic field have enough stiffness as well as damping coefficient for HTS bearing or vibration isolation because of strong pinning nature [8], [9]. As for the HTS Maglev vehicle, it acts like a "plane" flying over PMG because the magnetic field gradient is almost zero in the forward direction.…”

Section: Resultsmentioning

confidence: 99%

Stability of the Maglev Vehicle Model Using Bulk High Tc Superconductors at Low Speed

Zheng

Deng

Wang

et al. 2007

IEEE Trans. Appl. Supercond.

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Based on the study of static properties of the high temperature superconducting (HTS) Maglev vehicle, the dynamic characteristics and stability are investigated in the paper. A Maglev vehicle model using 86 bulk high Tc superconductors (HTSCs) is made at 1/4 scale of the first man-loading HTS Maglev test vehicle. Dynamic characteristics of the low-speed HTS vehicle in three directions are studied by measuring vibration signals of six essential point of the vehicle model. The natural frequency is analysed. 30 mm height is suggested as a reasonable field cooling height (FCH). Lower FCH brings the operation stability of the HTS Maglev system over permanent magnetic guideway (PMG) at low speed. Dynamic stability dependence on the speed of the HTS vehicle is quite different from that of the conventional Maglev vehicle system. The effect of speed on the unsafe motions can be suppressed by decreasing FCH in the operation of the vehicle model over the PMG to a great extent.Index Terms-Bulk YBCO, high-temperature superconductors, Maglev, permanent magnetic guideway, stability.

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“…In order to evaluate the results shown in Fig. 8, dynamic model of the rotor [5] is applied to the results. The model is composed of two SMBs which consist of the bearing stiffness and the damping coefficient .…”

Section: B Results and Discussionmentioning

confidence: 99%

Improving the Dynamics of a Flywheel Energy Storage System With Superconducting Magnetic Bearings

Komori

Kawashima

2004

IEEE Trans. Appl. Supercond.

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This paper describes a new method for improving the dynamics of a flywheel energy storage system using superconducting magnetic bearings (SMBs). The SMBs are composed of a ring-shaped superconductor and some permanent magnets (PM). Changes in stiffness and damping coefficient of the SMBs were investigated. Forced displacements are given to the SMBs to improve the stiffness and the damping coefficient. The stiffness and the damping coefficient are also evaluated by using the energy storage flywheel system.

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Dynamic characteristics of a high-T c superconducting bearing with a set of alternating-polarity magnets

Cited by 15 publications

References 12 publications

Modeling and identification of the hysteresis nonlinear levitation force in HTS maglev systems

Modeling and identification of the hysteresis nonlinear levitation force in HTS maglev systems

Stability of the Maglev Vehicle Model Using Bulk High Tc Superconductors at Low Speed

Improving the Dynamics of a Flywheel Energy Storage System With Superconducting Magnetic Bearings

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