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相关概念视频

Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

4.0K
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...
4.0K
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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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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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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相关实验视频

Updated: Jun 26, 2025

Magnetic Tweezers for the Measurement of Twist and Torque
11:41

Magnetic Tweezers for the Measurement of Twist and Torque

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基于单个FePt旋转轨道扭矩装置的宽线性范围3D磁传感器和角度位置探测器.

Ying Tao1,2,3, Zhe Guo4, Shihao Li5

  • 1School of Automation, China University of Geosciences, Wuhan 430074, China.

ACS applied materials & interfaces
|May 14, 2024
PubMed
概括

这项研究引入了一种新的单一L10-FePt霍尔条装置,用于广泛的3D磁场传感. 创新的传感器提供了改进的线性和降低噪音,提高了汽车应用中的精度.

关键词:
3D磁传感器是一个3D磁传感器.在L10 FePtt角度位置检测探测器垂直的磁性异构性是垂直的旋转轨道扭矩

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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

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相关实验视频

Last Updated: Jun 26, 2025

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 纳米技术纳米技术

背景情况:

  • 传统的3D磁传感器往往由于集成多个传感器而遭受大尺寸和错位.
  • 在汽车等行业,精确的运动控制在很大程度上依赖于精确的3D磁传感.

研究的目的:

  • 开发一个紧且高度线性的3D矢量磁传感器.
  • 为了展示一种能够高精度测量磁场元件的单一Hall-bar设备.
  • 探索非接触角度位置检测中的应用.

主要方法:

  • 使用单个L10-FePt霍尔条装置进行磁场检测.
  • 利用旋转轨道扭矩主导的磁化逆转来进行异常的霍尔电阻测量.
  • 描述传感器的灵敏度,线性范围和磁噪声水平.

主要成果:

  • 实现了高灵敏度 (291 VA^-1 T^-1 在z轴上,27 VA^-1 T^-1 在平面上).
  • 证明了x,y和z磁场组件的广泛线性响应范围 (±200 Oe).
  • 报告了7.9nV的低磁噪声水平在1Hz,提高了低频测量分辨率.

结论:

  • 单一的L10-FePt Hall-bar装置为先进的3D磁传感提供了一个有前途的解决方案.
  • 传感器的性能特性适用于精确的位置,角度和旋转检测.
  • 潜在的应用包括增强的旋转运动控制系统.