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Related Concept Videos

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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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.
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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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A toroid is a closely wound donut-shaped coil constructed using a single  conducting wire. In general, it is assumed that a toriod consists of  multiple circular loops perpendicular to its axis.
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The self-inductance of a circuit, often simply called the inductance, is a purely geometric factor that depends only on the circuit component's structure. More specifically, it depends on the shape and size of the component that lets the flux pass through it, thus inducing an electric field that opposes any current passing through it.
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Magnetic Field of a Solenoid01:18

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
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Related Experiment Video

Updated: May 20, 2025

Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Design and Simulation of Magnetic Shielding Structure Based on Closed-Loop TMR Current Sensor.

Qiuyang Li1, Suqin Xiong1, Shuo Wang2

  • 1China Electric Power Research Institute Co., Ltd., Beijing 100192, China.

Micromachines
|March 27, 2025
PubMed
Summary

This study enhances tunnel magnetoresistance (TMR) current sensors with a novel magnetic shielding package. The new design significantly improves sensitivity and accuracy, making TMR sensors more reliable in strong magnetic fields.

Keywords:
COMSOL Multiphysicsclosed-loop TMR current sensorcurrent sensorshielded structure

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Physics

Background:

  • Tunnel magnetoresistance (TMR) current sensors offer high sensitivity, linearity, and a wide measurement range, leading to their widespread industrial adoption.
  • Closed-loop TMR sensors are crucial for precise current detection in various applications.
  • External electromagnetic interference poses a significant challenge to the accuracy and stability of TMR current sensors.

Purpose of the Study:

  • To analyze structural parameters influencing the sensitivity of closed-loop TMR current sensors.
  • To propose and design a novel magnetic shielding package architecture for TMR current sensors.
  • To evaluate the effectiveness of the proposed shielding in improving sensor performance under electromagnetic interference.

Main Methods:

  • Utilized COMSOL Multiphysics 6.2 software for finite element analysis of TMR sensor structures.
  • Designed and simulated a novel magnetic shielding package architecture.
  • Conducted current detection experiments in a strong magnetic field environment to validate simulation results.

Main Results:

  • The novel magnetic shielding package architecture demonstrated a 44.3% improvement in shielding efficiency compared to a single magnetic ring.
  • Measurement accuracy was enhanced by 2.1 times relative to traditional TMR sensor structures.
  • Experimental validation confirmed the shielding package's effectiveness in suppressing external electromagnetic interference and enhancing sensor stability.

Conclusions:

  • The developed magnetic shielding package significantly enhances the performance of closed-loop TMR current sensors.
  • This research provides valuable theoretical and practical insights for deploying high-precision TMR sensors in challenging electromagnetic environments.
  • The findings pave the way for more robust and accurate current sensing solutions in industrial applications.