Magnetic levitation in the field of a rotating dipole.

IF 2.2 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
Grégoire Le Lay, Sarah Layani, Adrian Daerr, Michael Berhanu, Rémy Dolbeault, Till Person, Hugo Roussille, Nicolas Taberlet
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引用次数: 0

Abstract

It is well known that two permanent magnets of fixed orientation will either always repel or attract one another regardless of the distance between them. However, if one magnet is rotated at sufficient speed, a stable position at a given equilibrium distance can exist for a second free magnet. The equilibrium is produced by magnetic forces alone, which are strong enough to maintain a levitating state under gravity. We show that a stable levitation can be obtained when the rotating magnet is tilted from the rotation axis, with no offset in its position. In this regime, the levitating magnet remains centered and its spinning rate remains negligible, while its magnetic moment precesses in synchronization with the driving magnet. We provide a physical explanation of the levitation through a model relying on static dipolar interactions between the two magnets and present experimental results which validate the proposed theory.

旋转偶极子磁场中的磁悬浮。
众所周知,两块方向固定的永磁体,无论它们之间的距离如何,要么总是相互排斥,要么总是相互吸引。然而,如果一块磁铁以足够的速度旋转,第二块自由磁铁就会在给定的平衡距离上存在一个稳定的位置。这种平衡仅由磁力产生,而磁力足以在重力作用下维持悬浮状态。我们的研究表明,当旋转磁体偏离旋转轴,而其位置没有偏移时,可以获得稳定的悬浮状态。在这种情况下,悬浮磁体保持居中,其旋转速率可忽略不计,而其磁矩则与驱动磁体同步前行。我们通过一个依赖于两块磁铁之间静态偶极相互作用的模型,提供了悬浮的物理解释,并展示了验证所提理论的实验结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physical Review E
Physical Review E PHYSICS, FLUIDS & PLASMASPHYSICS, MATHEMAT-PHYSICS, MATHEMATICAL
CiteScore
4.50
自引率
16.70%
发文量
2110
期刊介绍: Physical Review E (PRE), broad and interdisciplinary in scope, focuses on collective phenomena of many-body systems, with statistical physics and nonlinear dynamics as the central themes of the journal. Physical Review E publishes recent developments in biological and soft matter physics including granular materials, colloids, complex fluids, liquid crystals, and polymers. The journal covers fluid dynamics and plasma physics and includes sections on computational and interdisciplinary physics, for example, complex networks.
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