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Related Concept Videos

Capacitor With A Dielectric01:18

Capacitor With A Dielectric

Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Capacitor in an AC Circuit01:23

Capacitor in an AC Circuit

A capacitor is charged by passing an electric current through it, which causes the plates to start accumulating an electrostatic charge. Since the strength of the charging current is maximum when the capacitor plates are uncharged and gradually decreases exponentially until the capacitor is fully charged, the charging process is neither instantaneous nor linear. The property of a capacitor to store a charge on its plates is called its capacitance.
Consider a purely capacitive circuit consisting...
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
PD Controller: Design01:26

PD Controller: Design

In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
Electro-mechanical Systems01:19

Electro-mechanical Systems

Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...

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Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators
14:42

Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators

Published on: April 25, 2020

A comb-drive actuator driven by capacitively-coupled-power.

Chao-Min Chang1, Shao-Yu Wang, Rongshun Chen

  • 1Institute of NanoEngineering and MicroSystems, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Rd., Hsinchu 30013, Taiwan. chaomin.chang@gmail.com

Sensors (Basel, Switzerland)
|November 1, 2012
PubMed
Summary
This summary is machine-generated.

A novel actuation mechanism for comb-drive actuators utilizes asymmetric finger overlap for capacitive coupling. This method enables electrostatic actuation without direct rotor electrical connections, simplifying heterogeneous device design.

Keywords:
actuation mechanismcapacitive couplingelectrostatic actuators

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Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators
11:44

Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators

Published on: August 15, 2014

Area of Science:

  • MEMS (Micro-Electro-Mechanical Systems)
  • Nanotechnology
  • Actuation Mechanisms

Background:

  • Comb-drive actuators are widely used in MEMS.
  • Traditional actuation methods often require complex wiring.
  • Heterogeneous integration in MEMS presents design challenges.

Purpose of the Study:

  • To introduce a new, simplified actuation mechanism for comb-drive actuators.
  • To enable electrostatic actuation via capacitive coupling without direct rotor power supply.
  • To facilitate the design of comb-drive actuators with heterogeneous structures.

Main Methods:

  • Theoretical analysis of static displacement and resonant frequency.
  • Fabrication of a comb-drive actuator with asymmetric finger overlap.
  • Experimental testing to validate the proposed actuation mechanism.

Main Results:

  • The proposed actuation mechanism successfully drove the comb-drive actuator.
  • Achieved a static displacement of 41.7 μm.
  • Measured a resonant frequency of 577 Hz.

Conclusions:

  • The novel actuation mechanism is effective for comb-drive actuators.
  • Eliminates the need for electrical connections to the rotor.
  • Simplifies the fabrication and actuation of MEMS devices with heterogeneous components.