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Eddy Currents01:25

Eddy Currents

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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
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Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

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The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
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Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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对螺旋梯度脉冲进行过渡的旋流分析.

Sadeq S Alsharafi1, Haile Baye Kassahun1, Ahmed M Badawi1

  • 1Systems and Biomedical Engineering, Faculty of Engineering, Cairo University, Cairo, Egypt.

Journal of magnetic resonance (San Diego, Calif. : 1997)
|June 14, 2023
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种计算框架,用于精确模拟MRI机器中的旋流,使用螺旋梯度波形. 该方法与现有工具进行了良好的验证,提供了高效和精确的分析,以更快地获得MRI.

关键词:
旋转的电流是流.渐变线圈 渐变线圈 渐变线圈磁共振成像技术 磁共振成像技术螺旋渐变脉冲脉冲的螺旋渐变脉冲流的功能 流的功能过渡性分析 过渡性分析

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科学领域:

  • 医学物理 医学物理
  • 电磁主义 电磁主义
  • 计算科学 计算科学

背景情况:

  • 旋流在MRI金属组件中通过快速切换梯度场来诱导.
  • 这些电流会造成不良影响,如热量,声噪声和MR图像扭曲.
  • 精确计算短暂的旋流对于缓解这些问题至关重要.

研究的目的:

  • 开发并介绍一个全面的计算框架,用于MRI中由螺旋梯度波形诱导的短暂的旋流.
  • 为了解决以往研究中的局限性,这些研究主要集中在形波形上.
  • 为了在快速MRI采集中准确预测和改善流效应.

主要方法:

  • 使用电路方程,专门针对螺旋梯度波形衍生了短暂的流的数学模型.
  • 使用定制多层积分方法 (TMIM) 实现的计算.
  • 验证的TMIM结果与Ansys的流分析对非屏蔽和屏蔽横线圈进行了验证.

主要成果:

  • 在TMIM和Ansys之间达成了高达成的协议,用于由螺旋波形诱导的短暂旋流计算.
  • 证明TMIM框架的高计算效率 (时间和内存).
  • 在使用屏蔽横线圈时,展示了流效应的减少.

结论:

  • 开发的TMIM提供了一个准确和高效的计算框架,用于分析由螺旋梯度波形诱导的旋流.
  • 这一框架对于通过预测和减轻相关扭曲来改进快速MRI采集技术是有价值的.
  • 这项研究证实了屏蔽在减少有害的流影响方面的有效性.