AC magnetic field induced rotation in levitating magnetostrictive wire
AC magnetic field induced rotation in levitating magnetostrictive wire
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DOI：
10.1109/tmag.2002.802407
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发表时间：
2002-12
期刊：
影响因子：
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通讯作者：
C. Luna;V. Raposo;G. Rauscher;M. Vázquez
中科院分区：
文献类型：
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作者：
C. Luna;V. Raposo;G. Rauscher;M. Vázquez
仅提供摘要表格。在适当的条件下，磁致伸缩导线在交变磁场(千赫量级)的作用下可以表现出自发的机械旋转(范围为几十赫兹)。据报道，无论合金成分和结构性质(非晶态或微晶态)如何，直径从0.1毫米到1毫米、长几厘米的金属丝都有这种令人惊讶的效应，但总是具有足够大的磁致伸缩。根据最近的实验，这种效应的起源与磁弹性驻波的产生有关，该驻波导致机械振动，并转化为有效的相干旋转。这进一步得到了这样一个事实的支持，即旋转可能是由薄膜扬声器激发的机械振动引起的。在本工作中，报道了直径为3 mm的FeNi多晶丝的最新结果，包括悬浮丝场致旋转。垂直配置的导线的悬浮是通过励磁线圈产生的磁力来实现的，以平衡重力。
Summary form only given. Magnetostrictive wires can exhibit spontaneous mechanical rotations (range of tens of Hz) when subjected to alternating magnetic field (order of kHz) under suitable conditions. This surprising effect has been reported in wires with diameter ranging from 0.1 to 1 mm, several cm long, irrespective of the alloy composition and structural nature (amorphous or microcrystalline), but always with large enough magnetostriction. According to recent experiments, the origin of the effect is connected to the generation of magnetoelastic standing wave resulting in mechanical vibrations that transform into effective coherent rotation. This is further supported by the fact that the rotation maybe induced by mechanical vibrations excited by a membrane loudspeaker. In the present work, latest results are reported in 3 mm diameter FeNi polycrystalline wires including field induced rotation in levitating wires. Levitation of the wire in a vertical configuration is achieved through magnetic forces generated by the exciting coil that balances gravitation.