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Related Concept Videos

Generator Voltage Control01:21

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,...
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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.
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Related Experiment Video

Updated: Oct 17, 2025

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
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Light-induced micro-vibrator with controllable amplitude and frequency.

Zhihai Liu, Kai Zhang, Wei Jin

    Optics Express
    |October 7, 2021
    PubMed
    Summary

    We developed a light-driven micro-vibrator using photophoretic force for adjustable reciprocating motion. This novel micromotor shows potential for applications in drug delivery and biosensing.

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    Area of Science:

    • Optics and Photonics
    • Microfluidics and Nanotechnology
    • Biomedical Engineering

    Background:

    • Photophoresis is a phenomenon where light exerts force on particles.
    • Controlling micro-scale devices with light offers non-contact manipulation advantages.
    • Existing micro-motors often face limitations in precise control and multi-particle operation.

    Purpose of the Study:

    • To propose and demonstrate a novel light-induced micro-vibrator.
    • To achieve adjustable reciprocating vibration using photophoretic force.
    • To explore simultaneous driving and modulation of multiple micro-vibrators.

    Main Methods:

    • Utilizing the Δα-typed photophoretic force for micro-vibrator actuation.
    • Employing Bessel-like beams for their self-healing properties.
    • Real-time control and modulation of vibration amplitudes and periods.

    Main Results:

    • Demonstrated a light-induced micro-vibrator with adjustable reciprocating motion.
    • Achieved precise real-time control over vibration amplitudes and periods.
    • Reached a maximum average restoring speed of 23.26 μm/s.
    • Successfully drove and modulated three micro-vibrators simultaneously using Bessel-like beams.

    Conclusions:

    • The proposed micro-vibrator functions as a novel light-driven micromotor.
    • The technology offers precise control and multi-particle manipulation capabilities.
    • Potential applications include targeted drug delivery, biosensing, and environmental detection.