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DC Generator

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 Generator

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: Alternator

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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...

Generation of Three-Phase Voltage

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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...

Generator Voltage Control

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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 14, 2026

Optimization, Test and Diagnostics of Miniaturized Hall Thrusters

Optimization, Test and Diagnostics of Miniaturized Hall Thrusters

Published on: February 16, 2019

The advanced helical generator.

D B Reisman¹, J B Javedani, G F Ellsworth

¹Lawrence Livermore National Laboratory, Livermore, California 94550, USA. reisman1@llnl.gov

The Review of Scientific Instruments

|April 8, 2010

Summary

This summary is machine-generated.

A new high explosive pulsed power generator, the advanced helical generator (AHG), was successfully designed and tested. It achieved 16 MA current and 11 MJ energy, demonstrating significant current gain for pulsed power applications.

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Area of Science:

High energy physics
Pulsed power systems
Explosive-driven generators

Background:

Pulsed power generators are crucial for various scientific and defense applications.
Developing generators with high current and energy gain remains a key challenge.
Previous designs often faced limitations in performance and reliability.

Purpose of the Study:

To design, build, and test a novel high explosive pulsed power generator.
To achieve significant current and energy gain through advanced design principles.
To validate the performance of the advanced helical generator (AHG) in a first-shot test.

Main Methods:

Utilized modern modeling tools for generator design.
Employed high-precision manufacturing techniques.
Integrated voltage and current management principles into the AHG design.

Main Results:

The advanced helical generator (AHG) achieved a first-shot success.
Delivered 16 MA of current and 11 MJ of energy to an 80 nH inductive load.
Obtained a current gain of 160 times with a 20 microsecond peak exponential rise time.

Conclusions:

The AHG design successfully met its performance objectives.
The generator demonstrates a viable approach for achieving high current and energy gain.
Further detailed analysis of the AHG design and testing will be presented.