高溫超導體YBCO在不同溫度下磁摩擦力的量測

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 學位論文 > Item 987654321/32506

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Title:	高溫超導體YBCO在不同溫度下磁摩擦力的量測
Other Titles:	The measurement of the magnetic frictional force of high Tc superconductor YBCO during different temperature
Authors:	楊湧評;Yang, Yung-pin
Contributors:	淡江大學物理學系碩士班陳偉正
Keywords:	YBCO;磁摩擦力;磁通子;YBCO;magnetic frictional force;magnetic fluxoids
Date:	2005
Issue Date:	2010-01-11 02:15:11 (UTC+8)
Abstract:	本論文的主要目的在研究高溫超導體YBCO在不同溫度下，探討在超導體上的永久磁鐵轉動，而得到不同溫度下旋轉頻率與時間的關係。經由探討所得到的數據我們發現在不考慮轉速較高的地方出現的共振所造成部分旋轉能量的轉移而影響磁鐵旋轉頻率遞減的因素有空氣阻力、渦漩電流與磁摩擦力;其中空氣阻力與渦漩電流所造成的旋轉能量損耗接與旋轉頻率成正比，而磁摩擦力與與溫度有關，溫度愈高磁通子進入超導體的數量愈多而磁摩擦力也就愈大。 The main objective of this project is to study the behavior of rotation frequency of a permanent magnet levitates above a high-temperature superconductor YBCO versus time under different temperature .There are several factors to slow down the rotation . Such as resonances at high rotation frequency, which can lead to partly energy transmit and decrease the frequency of rotation . For low speed rotation we have air drag on the magnet , eddy current inside the magnet and magnetic frictional force come from the superconductor . It was found that the lost of energy caused by Air drag and Eddy current is directly proportional to the rotation frequency. From our measurements, we found that the magnetic frictional force is a function of temperature . When temperature increases, the number of magnetic fluxoids entering the superconductor increases and this causing the magnetic frictional force increases too .
Appears in Collections:	[物理學系暨研究所] 學位論文

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