Testing and Comparison of Levitation Forces and Rotational Friction in Different Superconducting Tape Stacks
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ORIGINAL PAPER
Testing and Comparison of Levitation Forces and Rotational Friction in Different Superconducting Tape Stacks Zhaoxin Liu1 · Wenjiang Yang1
· Long Yu2 · Yu Ji1 · Mingliang Bai1 · Fawzi1 · Xiaodong Li1
Received: 30 April 2020 / Accepted: 23 June 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract High-temperature superconducting (HTS) tape stacks have broad applications in magnetic levitation because of the uniform induced current distribution, good heat dissipation, and preferable mechanical properties. Configuration of the stack is one of the primary factors on the uniformity and strength of the trapped magnetic field. In this paper, the levitation characteristics, which are levitation force, stiffness, and rotational friction of four different YBCO tape stack configurations, were compared. It is observed from the experiments that there is an obvious influence of stack configurations on the levitation characteristics. The levitation forces gradually improve with the increase of tape pieces. While the module No.2 is an inclined stack, the levitation force is related to the inclination angle. Most of the tape stack modules can give low loss rotation in levitation, and the magnitude of the friction coefficient is close to 10−6 . By the investigation of levitation characteristics, the tape stack has great potential for the bearing application. Keywords HTS tape stack modules · Levitation stiffness · Rotation friction coefficient
1 Introduction High-temperature superconducting magnetic levitation is widely used in bearing, flywheel, and some precision devices due to its advantages of self-stabilizing and low friction loss [1–3]. The levitation performances of the magnetized superconducting bulk have been studied for more than 30 years because bulk superconductors have the Wenjiang Yang
[email protected] Zhaoxin Liu [email protected] Long Yu [email protected] Yu Ji [email protected] Mingliang Bai [email protected] 1
School of Astronautics, Beihang University, Beijing, 100191, China
2
The Aviation Industry Corporation of China, Ltd, Beijing, 100028, China
great potential to provide strong magnetic field shielding and flux pinning to construct compact magnetic stabilized structures for the magnetic levitation. In recent years, the possibility of forming an assembled superconducting tape stack to replace the HTS bulk has sparked a broad discussion [4]. Compared with conventional superconducting bulks, superconducting tape stack modules have higher critical current density, better thermal stability, greater mechanical strength, and a more flexible geometry [5]. In 2016, Tamegai et al. have successfully captured a magnetic field of 7.9 T in the center of the double stack [6]. Each tape stack is assembled from 130 layers of short-coated conductors. In 2017, Anup et al. successfully captured a 17.7-T magnetic field in the middle of two tape stack modules [7], and both modules had no external mechanical reinforcement, showing the strong potential of the superco
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