Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Eddy Currents01:25

Eddy Currents

1.5K
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...
1.5K
Motional Emf01:22

Motional Emf

3.1K
Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
3.1K
Magnetism01:30

Magnetism

6.2K
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
6.2K
Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

3.2K
Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process,...
3.2K
Magnetic Damping01:17

Magnetic Damping

412
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.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
412

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Depressive-cognitive interactions modulate amygdala and hippocampus functional connectivity in mild cognitive impairment.

Journal of Alzheimer's disease : JAD·2026
Same author

Aging affects glutamate-enriched functional networks in resting and movie-watching states.

NeuroImage·2026
Same author

Correlation of Patient-Reported Symptoms With Rhinogram Features Beyond Simple Airway Resistance.

The Annals of otology, rhinology, and laryngology·2026
Same author

Artesunate ameliorates experimental colitis by suppressing intestinal inflammation and modulating the gut microbiota.

Experimental animals·2026
Same author

Methotrexate-Induced Nephrotoxicity and Exposure Thresholds in Primary Central Nervous System Lymphoma: A Population PKPD Model.

Clinical pharmacology and therapeutics·2026
Same author

Dock2 Protects Colitis by Facilitating Akkermansia Colonization via Suppressing IL-22-Reg3 Activity.

Inflammation·2026

Related Experiment Video

Updated: May 25, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
00:08

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

6.2K

Position Detection System for Moving-Magnet Linear Motors Based on a Magnetoresistive Sensor Array.

Jun Wang1, Xiang Chen1,2, Quyan Chen3

  • 1College of Information Science and Technology, Nanjing Forestry University, Nanjing 210037, China.

Sensors (Basel, Switzerland)
|February 26, 2025
PubMed
Summary

This study introduces a novel position detection system for moving-magnet linear motors using magnetoresistive sensors. The system offers high accuracy and unlimited measurement range, overcoming limitations of traditional methods.

Keywords:
linear motormagnetoresistive sensor arraymoving magnetposition detection

More Related Videos

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System
06:58

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Published on: June 13, 2010

9.6K
High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

2.0K

Related Experiment Videos

Last Updated: May 25, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
00:08

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

6.2K
Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System
06:58

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Published on: June 13, 2010

9.6K
High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

2.0K

Area of Science:

  • Robotics and Automation
  • Sensor Technology
  • Electromechanical Systems

Background:

  • Moving-magnet linear motors are crucial for modern automation.
  • Existing position detection methods (magnetic grid-scale, grating-scale) are inadequate for these motors due to disturbances, cost, and range limitations.

Purpose of the Study:

  • To develop and validate a new position detection system for moving-magnet linear motors.
  • To address the limitations of conventional position sensing technologies.

Main Methods:

  • An array of magnetoresistive sensors was arranged parallel to the motor's armature trajectory.
  • A permanent magnet on the rotor was detected by the sensors, generating voltage signals proportional to position changes.
  • Data acquisition using AD7606 and processing by FPGA and STM32 controllers enabled position calculation.

Main Results:

  • The proposed system demonstrated a higher linear correlation coefficient compared to magnetic grid rulers.
  • Achieved an accuracy of ±9 μm, validating its effectiveness.
  • The system offers an unlimited measurement range suitable for long-distance applications.

Conclusions:

  • The magnetoresistive sensor array system is a viable and accurate solution for position detection in moving-magnet linear motors.
  • This technology overcomes the drawbacks of traditional methods, enabling precise control in automation.
  • The system's scalability and accuracy make it suitable for demanding industrial applications.