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Related Concept Videos

Torque On A Current Loop In A Magnetic Field01:13

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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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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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Related Experiment Video

Updated: Mar 14, 2026

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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A Missile-Borne Angular Velocity Sensor Based on Triaxial Electromagnetic Induction Coils.

Jian Li1, Dan Wu2, Yan Han3

  • 1Institute of Signal Capturing & Processing Technology, Key Laboratory of Shanxi Province, North University of China, Taiyuan 030051, China. lijian851208@126.com.

Sensors (Basel, Switzerland)
|October 6, 2016
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Summary

A novel self-adaptive electromagnetic induction method enhances angular motion measurement for high-speed projectiles. This technique offers a wide dynamic range and high precision, crucial for guidance and control applications.

Keywords:
FPGAangular displacementangular velocityself-adaptive frequency tracking measurement

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Area of Science:

  • Aerospace Engineering
  • Electromagnetism
  • Sensor Technology

Background:

  • Limited measurement range for angular motion parameters of high-speed rotating projectiles hinders guidance and control.
  • Existing methods struggle with the extreme dynamic range of rotational speeds.

Purpose of the Study:

  • To propose a self-adaptive measurement method for angular motion parameters of high-speed rotating projectiles.
  • To overcome the limitations of current measurement techniques in terms of range and precision.

Main Methods:

  • Utilized a bent "I-shape" framework for triaxial orthogonal coils to acquire induction signals from projectile motion in a geomagnetic field.
  • Implemented a self-adaptive pulse signal frequency adjustment.
  • Calculated angular velocity and displacement via periodic pulse counting and accumulation.

Main Results:

  • Developed a prototype sensor based on the proposed principle.
  • Experimental tests (semi-physical and physical simulations) validated the sensor's performance.
  • Achieved a wide angular velocity measurement range (1-100 rps) with <0.3% error and angular displacement error <0.2°.

Conclusions:

  • The proposed self-adaptive electromagnetic induction method satisfies measurement requirements for high-speed rotating projectiles.
  • Demonstrated high precision and an extremely high dynamic range of rotational speed.
  • Offers significant value for engineering applications in attitude determination and geomagnetic navigation.