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Related Concept Videos

Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
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...
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...
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...
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...
Generator Voltage Control01:21

Generator Voltage Control

Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...

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Related Experiment Video

Updated: Jun 25, 2026

Magnetic Levitation Coupled with Portable Imaging and Analysis for Disease Diagnostics
07:42

Magnetic Levitation Coupled with Portable Imaging and Analysis for Disease Diagnostics

Published on: February 19, 2017

Electric generator using a triangular diamagnetic levitating rotor system.

Joe Nhut Ho1, Wei-Chih Wang

  • 1Department of Mechanical Engineering, University Of Washington, Seattle, Washington 98195, USA.

The Review of Scientific Instruments
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

This study explores a novel low-friction generator using a diamagnetic levitation system. Experiments validate predictive models for electromagnetic induction (emf) in different coil designs, showing feasibility for efficient power generation.

Related Experiment Videos

Last Updated: Jun 25, 2026

Magnetic Levitation Coupled with Portable Imaging and Analysis for Disease Diagnostics
07:42

Magnetic Levitation Coupled with Portable Imaging and Analysis for Disease Diagnostics

Published on: February 19, 2017

Area of Science:

  • Physics
  • Electrical Engineering
  • Materials Science

Background:

  • Traditional generators face challenges with friction and maintenance.
  • Diamagnetic levitation offers a potential solution for reduced mechanical wear.
  • Developing efficient energy harvesting devices is crucial for sustainable technology.

Purpose of the Study:

  • To assess the feasibility of a low-friction generator utilizing a diamagnetically stabilized levitating rotor.
  • To develop and validate predictive models for electromagnetic induction (emf) generated by the rotor.
  • To optimize coil geometry and placement for maximum power output.

Main Methods:

  • Designed a planar rotor with a triangular magnet configuration for diamagnetic levitation.
  • Developed theoretical equations to predict emf generated by passing the rotor over coils.
  • Investigated two coil geometries: segmental arc and circular.
  • Formulated an optimization method for coil size and position.
  • Conducted experiments to measure induced emf and compare with predictions.

Main Results:

  • Experimental emf waveforms closely matched predicted waveforms for both coil designs.
  • The optimization theory accurately predicted the outcome of induced waveforms.
  • Achieved an induced emf of 1.7 mV at 21.8 rad/s for the segmental arc coil.
  • Generated 1.25 mV at 28.1 rad/s using the circular coil design.

Conclusions:

  • The diamagnetic levitation generator concept is feasible.
  • The developed theoretical models and optimization methods are effective for predicting performance.
  • The study provides a foundation for designing efficient, low-maintenance generators.