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Related Concept Videos

Faraday Disk Dynamo01:23

Faraday Disk Dynamo

A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
Van de Graaff Generator01:15

Van de Graaff Generator

Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
Energy In A Magnetic Field01:24

Energy In A Magnetic Field

If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus negligible.
The energy...
DC Generator01:19

DC Generator

An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts mechanical energy into electrical energy, which are DC pulses with the same polarity. The construction of a DC generator is similar to that of an alternator, except that the pair of slip rings is replaced by a single split ring, also called a commutator. The commutator functions like a periodic rotary switch; it changes the contacts with the...
Electric Generator: Alternator01:25

Electric Generator: Alternator

Electric generators induce an emf by rotating a coil in a magnetic field. A simple alternator is an AC generator that creates electrical energy that varies sinusoidally with time. A simple alternator consists of a conducting loop that is placed inside a uniform magnetic field. The loop is connected to split rings connected to the external circuit with the help of brushes.
The magnetic flux passing through the coil varies sinusoidally as the loop rotates inside the magnetic field. This...
Motional Emf01:22

Motional Emf

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 magnetic...

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Related Experiment Video

Updated: Jun 26, 2026

Electric and Magnetic Field Devices for Stimulation of Biological Tissues
13:29

Electric and Magnetic Field Devices for Stimulation of Biological Tissues

Published on: May 15, 2021

Fast-charging compact seed source for magnetic flux compression generators.

M Elsayed1, M Kristiansen, A Neuber

  • 1Department of Electrical and Computer Engineering, Center for Pulsed Power and Power Electronics, Texas Tech University, Lubbock, Texas 79409, USA.

The Review of Scientific Instruments
|January 7, 2009
PubMed
Summary

A new battery-powered compact seed source (CSS) utilizes solid-state components to drive flux compression generators (FCGs). This portable system delivers high current pulses for pulsed power applications, improving on traditional capacitor-based designs.

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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

Area of Science:

  • Electrical Engineering
  • Pulsed Power Systems
  • Solid-State Electronics

Background:

  • Flux compression generators (FCGs) are compact, mobile pulsed power sources with high energy density.
  • Driving FCGs necessitates a high-current seed source, traditionally using spark gaps and capacitor discharge.
  • Existing seed sources are often bulky and rely on less reliable triggering mechanisms.

Purpose of the Study:

  • To design and evaluate a novel, self-contained, single-use compact seed source (CSS) for FCGs.
  • To implement a solid-state switching scheme for improved performance and reduced size.
  • To demonstrate a portable pulsed power solution with rapid charging capabilities.

Main Methods:

  • Development of a compact, battery-powered CSS (0.005 m³, 3.9 kg) with a charge time under 40 seconds.
  • Integration of off-the-shelf high-voltage semiconductor components for the solid-state switching.
  • Experimental characterization of the CSS, focusing on switching mechanics and component performance into a 5.20 μH load.

Main Results:

  • The CSS successfully delivered over 360 J (approx. 12 kA) into a 5.20 μH inductive load.
  • Achieved high-current pulse delivery with microjoule trigger energy at TTL levels.
  • Demonstrated the viability of solid-state components for compact, high-current pulsed power seed sources.

Conclusions:

  • The developed solid-state CSS offers a significant advancement over traditional FCG seed sources.
  • This compact and portable system is suitable for single-use pulsed power applications.
  • The use of readily available semiconductor components minimizes cost and size for practical deployment.