Load test of Superconducting Magnetic Bearing for MW-class Flywheel Energy Storage System

Mukoyama, S.; Nakao, Kengo; Sakamoto, H.; Nagashima, K.; Ogata, Masafumi; Yamashita, Tomohisa; Miyazaki, Kazufumi; Shimizu, Hideki; Sawamura, H

doi:10.1088/1742-6596/871/1/012090

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…Benefiting from self-stable suspension and moderate stiffness in the radial and axial directions, bulk high-temperature superconductors (HTS) have many engineering applications, such as maglev trains [1,2], superconducting bearings [3,4], flywheel energy storage (FES) systems [5,6] and high-resolution devices [7,8]. In addition, extensive advances have been made in understanding and reducing rotational losses in HTS magnetic bearings, especially for application in FES systems with a high rotation speed [9,10].…”

Section: Introductionmentioning

confidence: 99%

Loading capacity, rotation loss and torsional oscillation research on an Evershed-type hybrid superconducting bearing used for micro-thrust measurements

Liu

Yang²,

Zhao³

et al. 2022

Supercond. Sci. Technol.

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Characterized by very low rotational drag, applications of high temperature superconductor (HTS) bearings have been expanded in some high precision instruments. We developed a sensitive magnetic suspension stand based on an Evershed-type hybrid HTS bearing to measure the micro newton level thrust. The hybrid HTS bearing is to use the strong attractive force of a permanent magnet (PM) biased bearing to support main loading in the bearing, while the instability in the PM biased bearing was compensated by the magnetic stability from an HTS bearing. Compared to the single PM/HTS bearing, the hybrid HTS bearing is intended not only to support larger load and but also to suppress the rotation loss and levitation drift. Loading capacity, loss and damping torque were explored at different design parameters such as bearing gaps L1, L2, field cooling height (FCH) of bulk HTSs. Spin down testing suggested that the loss of the hybrid HTS bearing can be reduced by raising the HTS bearing gap L2 or reducing the field cooling height. The hybrid HTS bearing showed a typical oscillation behavior in the extreme low frequency, and torsional pendulum testing suggested that the spring constant k of the hybrid HTS bearing can be as low as 36.39 μN·m/°. A micro-thrust stand based on the hybrid HTS bearing was established to test an electrospray thruster in the vacuum chamber, and the measurement result of 26.61 μN presents the ability of micro-thrust stand to achieve μN level testing.

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Section: Introductionmentioning

confidence: 99%

Loading capacity, rotation loss and torsional oscillation research on an Evershed-type hybrid superconducting bearing used for micro-thrust measurements

Liu

Yang²,

Zhao³

et al. 2022

Supercond. Sci. Technol.

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show abstract

“…Friction free superconducting bearings are suitable for high-speed applications, which include linear as well as rotational setups, as shown by many groups in recent years [1][2][3][4][5]. Although there is no mechanical friction in the bearing, other dissipating losses might be generated [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Dependency of hysteretic loss on speed and tilt in a rotating superconducting magnetic bearing

Espenhahn

Sparing

Berger

et al. 2021

Supercond. Sci. Technol.

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Superconducting magnetic bearings enable friction-free rotation, which is beneficial for different applications. Whereas mechanical losses are drastically reduced, additional hysteretic losses might be generated as for example by a process-related tilt of the field-cooled permanent magnet of the superconducting bearing. We designed a caloric measurement setup with a resolution down to 5 mW in order to study such losses in more detail. Therefore, a field-cooled magnet ring is deliberately tilted up to 3° before it rotates with a speed of up to 5000 rpm above the superconducting ring. The generated losses inside the superconductor lead to an increased evaporation rate in the attached liquid nitrogen bath, which in turn results to a measurable volume flow. The determined losses increase almost linear with speed, whereas an exponential increase was observed for the tilt angle. The results were confirmed by 2D simulations using a two-component model leading to similar dependencies for the hystertic losses on speed and tilt.

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Adaptive notch filter design for levitation sensing system based on vibration computation

Zhang

2017

Cluster Comput

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Load test of Superconducting Magnetic Bearing for MW-class Flywheel Energy Storage System

Cited by 7 publications

References 3 publications

Loading capacity, rotation loss and torsional oscillation research on an Evershed-type hybrid superconducting bearing used for micro-thrust measurements

Loading capacity, rotation loss and torsional oscillation research on an Evershed-type hybrid superconducting bearing used for micro-thrust measurements

Dependency of hysteretic loss on speed and tilt in a rotating superconducting magnetic bearing

Adaptive notch filter design for levitation sensing system based on vibration computation

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