Characteristics of lift and restoring force in HTS bulk-Application to two-dimensional maglev transporter

Abstract

Abstmct-One of the advantages of magnetic levitation using high-temperature superconducting (HTS) bulk i s that stable levitation can be achieved without any control systems. We have been investigating the electromagnetic behaviors of HTS bulk to realize a two-dimensional magnetic levitating transporter without any fixed guides. The characteristics of lift and stability are key parameters to design and optimize such a device. We measured the lift and the restoring force of a YBCO bulk, displaced by a distance in lateral direction, for various field-cooling conditions and permanent-magnet arrangements, Both lift and restoring force are closely related to the a i r gap in the field-cooling process, distance between the permanent magnets, number of permanent magnets, and permanent magnet arrangement, that is, external magnetic field distribution. The most suitable arrangement o f permanent magnets depends on the required levitation height and the weight of the levitating part. I t can be considered that the size of the levitating part and geometry are also very important to determine the optimal arrangement in the maglev device.

Development of Pipeline Transporter System Using Pinning Effect of High-Temperature Superconducting Bulks

“…Since the air gap was changed slowly in measurement of the lateral force, the anisotropic critical state model was assumed in the simulation. This model is formulated as follows: (1) where , and are the current densities of , and -axis, respectively. and are the critical current densities of -plane and -axis, respectively.…”

“…The levitating transportation system using HTS bulks and permanent magnets can be applied to the clean room and so on because the levitating part can move without any mechanical contact. In our previous research, the levitating characteristics between HTS bulks and permanent magnets have been clarified [1]- [4]. We have success to estimate the numerical simulation based on three-dimensional hybrid finite element and boundary element (3D hybrid FE-BE) method and applied them to electromagnetic field problems including HTS bulks [5].…”

Implementation of a Non-Contact X-Y Mover With High Temperature Superconductors

“…In other words, a passive and stable magnetic levitation system can be obtained in a properly designed HTS/PM system. Several levitation systems using HTS bulks along with permanent magnets have been reported [6]- [8]. There were also reports of some levitation systems that used HTS bulks and electromagnet arrays [9]- [11], however, the electromagnets must be excited all the time in order to keep the mover levitated.…”

Fundamental characteristics and 3D electromagnetic analysis for magnetic levitation transporter using YBCO superconductors

“…1 [1][2][3]. This transporter consists of a controllable driving unit with bulk superconductors mounted on it and a levitation unit having permanent magnets arranged opposite these superconductors.…”