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Magnetic Damping

Magnetic Damping

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...

Motional Emf

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Charging Conductors By Induction

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Related Experiment Video

Updated: Jun 12, 2026

Reactive Inkjet Printing and Propulsion Analysis of Silk-based Self-propelled Micro-stirrers

Reactive Inkjet Printing and Propulsion Analysis of Silk-based Self-propelled Micro-stirrers

Published on: April 26, 2019

Note: Development of a small maglev-type antirolling system.

Cheol Hoon Park¹, Hee Chang Park, Han Wook Cho

¹Nano Convergence and Manufacturing Systems Research Division, Korea Institute of Machinery and Materials, 171 Jang-dong, Yuseong-gu, Daejeon 305-343, Republic of Korea. parkch@kimm.re.kr

The Review of Scientific Instruments

|June 3, 2010

Summary

A novel magnetic levitation (maglev)-type active mass driver (AMD) effectively controls ship rolling motion. This friction-free system shows promise for stabilizing vessels at sea.

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Laser Micromachining for Polymer Surface Topography Design

Laser Micromachining for Polymer Surface Topography Design

Published on: September 19, 2025

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Last Updated: Jun 12, 2026

Reactive Inkjet Printing and Propulsion Analysis of Silk-based Self-propelled Micro-stirrers

Reactive Inkjet Printing and Propulsion Analysis of Silk-based Self-propelled Micro-stirrers

Published on: April 26, 2019

Laser Micromachining for Polymer Surface Topography Design

Laser Micromachining for Polymer Surface Topography Design

Published on: September 19, 2025

Area of Science:

Naval Architecture and Marine Engineering
Control Systems Engineering
Ocean Engineering

Background:

Ship rolling motion poses significant challenges for vessel stability and operational safety.
Existing antirolling devices often involve friction or complex mechanisms.

Purpose of the Study:

To develop and evaluate a magnetic levitation (maglev)-type active mass driver (AMD) for suppressing ship rolling motion.
To demonstrate the feasibility of a friction-free AMD system for marine applications.

Main Methods:

Designed and constructed a small-scale maglev-type AMD with a 4.0 kg moving mass.
Integrated the AMD into a small-scale catamaran model.
Conducted experimental tests to assess the system's performance in controlling rolling motion.

Main Results:

The maglev-type AMD operated without friction due to magnetic levitation and linear motor propulsion.
Experimental results demonstrated the system's capability to actively control rolling motion.
The developed AMD showed significant potential for stabilizing marine vessels.

Conclusions:

The maglev-type AMD is a viable and effective solution for controlling the rolling motion of ships.
This friction-free technology offers a promising advancement in marine stabilization systems.
Further development could lead to practical applications in various oceanographic vessels.