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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

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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...
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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.
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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Precision current regulator for NMR electromagnets.

Mark S Conradi1, Hilary T Fabich1

  • 1ABQMR, Inc., 2301 Yale Blvd. SE, Suite C2, Albuquerque, NM 87106, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 11, 2020
PubMed
Summary
This summary is machine-generated.

Achieve stable magnetic fields by precisely regulating current. A new dc-dc fluxgate transformer design enhances current stability by 50x, improving NMR frequency precision for over an hour.

Keywords:
Current regulationCurrent stabilityDc-dc transformerField regulationField stabilityFluxgate

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Area of Science:

  • Physics
  • Electrical Engineering
  • Instrumentation

Background:

  • Magnetic field stability in electromagnets and superconducting magnets is crucial for precise measurements.
  • Field stability is often limited by current fluctuations in the magnet power supply.

Purpose of the Study:

  • To present a simple and effective current regulator design.
  • To improve the stability of magnetic fields for applications like Nuclear Magnetic Resonance (NMR).

Main Methods:

  • Development of a current regulator using a high-precision, direct current-to-direct current (dc-dc) fluxgate transformer.
  • Integration of the regulator with existing current supplies.

Main Results:

  • The proposed regulator stabilized output current by a factor of approximately 50.
  • This resulted in a corresponding stabilization of the NMR frequency.
  • Stability was maintained over observation times of about one hour.

Conclusions:

  • The fluxgate transformer-based current regulator offers a significant improvement in current and field stability.
  • The method is versatile and applicable to a wide range of current supply systems.
  • This technique enhances the precision and reliability of experiments requiring stable magnetic fields.