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Related Concept Videos

Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
Consider a solenoid with 100 turns wrapped around a cylinder of...

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Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators
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A low noise modular current source for stable magnetic field control.

Valerio Biancalana1, Giuseppe Bevilacqua1, Piero Chessa1

  • 1DIISM University of Siena, CNISM, Via Roma, 56, 53100 Siena, Italy.

The Review of Scientific Instruments
|April 5, 2017
PubMed
Summary

This study introduces a low-cost, stable, and programmable unipolar current source. Its modular design and hybrid approach enhance control for multiple DC sources, reducing power loss and crosstalk.

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Area of Science:

  • Electrical Engineering
  • Electronics Design
  • Power Electronics

Background:

  • Development of stable and programmable DC current sources is crucial for various electronic applications.
  • Existing solutions often face limitations in cost, stability, power dissipation, or modularity.
  • Need for a versatile current source suitable for simultaneous control of multiple DC outputs.

Purpose of the Study:

  • To describe a novel low-cost, stable, and programmable unipolar current source.
  • To present a modular circuit design for simultaneous control of multiple DC sources.
  • To detail a hybrid switching/linear design for improved performance and reduced power dissipation.

Main Methods:

  • Implementation of a hybrid switching and linear circuit topology.
  • Design for modularity, enabling parallel or multi-unit configurations.
  • Analog voltage control for current programmability via digital-to-analog conversion cards.

Main Results:

  • Achieved a low-cost, stable, and programmable unipolar current source.
  • Demonstrated reduced power dissipation and minimized cross-talking through hybrid design.
  • Enabled flexible output configurations with variable current and voltage compliance from a single supply.

Conclusions:

  • The developed current source offers a cost-effective and stable solution for programmable current control.
  • The modular and hybrid design enhances performance and suitability for multi-channel applications.
  • Analog voltage control provides precise programmability, compatible with standard digital-to-analog converters.