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DC Generator01:19

DC Generator

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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...
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Energy in Simple Harmonic Motion01:23

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To determine the energy of a simple harmonic oscillator, consider all the forms of energy it can have during its simple harmonic motion. According to Hooke's Law, the energy stored during the compression/stretching of a string in a simple harmonic oscillator is potential energy. As the simple harmonic oscillator has no dissipative forces, it also possesses kinetic energy. In the presence of conservative forces, both energies can interconvert during oscillation, but the total energy remains...
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Full wave rectifier01:22

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A full-wave rectifier is a device that converts alternating current (AC) to direct current (DC) and is more efficient than its half-wave counterpart. It typically includes a center-tapped transformer, two diodes, and a load resistor. The secondary winding of the transformer is divided to provide two equal voltages of opposite polarities, which is the pivotal element of full-wave rectification.
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Faraday Disk Dynamo01:23

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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...
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Half wave rectifier01:20

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A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.
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Forced Oscillations01:06

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When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
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Related Experiment Video

Updated: Jul 30, 2025

A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure
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A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure

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Energy harvesting from mechanical vibrations: self-rectification effect.

Gholamreza Ghashami1,2, Maryam Mahnama1, Mahdi Moghimi Zand2

  • 1School of Mechanical Engineering, College of Engineering, University of Tehran, 14399-55961, Tehran, Iran.

Physical Chemistry Chemical Physics : PCCP
|May 15, 2023
PubMed
Summary
This summary is machine-generated.

This study demonstrates hexagonal boron nitride nanostructures that harvest energy from vibrations and convert AC to DC voltage without external circuits. This innovation advances battery-free nanoscale energy harvesting devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Harvesting

Background:

  • Environmental vibrations offer a promising energy source for small-scale energy harvesting (EH) devices.
  • Efficient conversion of alternating current (AC) to direct current (DC) is crucial for powering electronic devices.
  • Current EH devices often require external rectifying circuits and batteries, limiting their scalability and efficiency.

Purpose of the Study:

  • To propose a novel method for simultaneous energy harvesting and voltage rectification using hexagonal boron nitride (h-BN) nanostructures.
  • To eliminate the need for external rectifying circuits and batteries in nanoscale EH devices.
  • To explore the potential of h-BN nanoribbons and nanotubes for self-rectifying energy harvesting.

Main Methods:

  • A molecular dynamics approach was employed to simulate the response of h-BN nanostructures to mechanical vibrations.
  • Calculated the polarization and voltage generated under tensile and compressive strain fields.
  • Investigated the phenomenon of mechanical buckling in nano-structures to achieve voltage rectification.

Main Results:

  • Demonstrated that h-BN nanoribbons and nanotubes can harvest energy from vibrations.
  • Showcased the simultaneous rectification of output voltage without external circuits.
  • Engineered the buckling of nano-mechanical structures to achieve self-rectification of generated voltage.

Conclusions:

  • Hexagonal boron nitride nanostructures offer a promising route for integrated energy harvesting and voltage rectification.
  • This approach eliminates the need for batteries and external rectifiers, paving the way for more efficient and scalable nanoscale EH devices.
  • The findings enable the design of advanced, self-powered electronic systems and sensors.