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Magnetic field of a bar magnet
Magnetic field of a bar magnet

lecture1429901112
lecture1429901112

EN14 107 Basics of Electrical and Electronics & Communication Engg.
EN14 107 Basics of Electrical and Electronics & Communication Engg.

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... the near field (distance < /2), however, E/H may be much greater or less than 377 . If E/H is much greater than 377 , then any interference is more likely to be due to the Efield and the coupling to the receptor is primarily capacitive. The emission may be radiated from binding posts or long pin ...
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Flux Reflection Model of Ferroresonant Circuit Realized Using

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10. energy efficient technologies in electrical systems

... decreases with speed for many VSD applications, the absolute loss is often not very significant. The power factor of a VSD drops drastically with speed, but at low power requirement the absolute kVAr requirement is low, so the loss is also generally not significant. In a suitable operating environme ...
CONTENTS - Hodder Education
CONTENTS - Hodder Education

... Faraday made three important discoveries about EMI. He found out that he could increase the size of the induced current by:  moving the magnet faster  using a stronger magnet  using a coil with a greater number of turns. All three of the above have the effect of increasing the rate at which the m ...
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... When emf induced in a conductor is stationary in a magnetic field then we call it statically induced emf. If emf is induced in a conductor due to relative motion between conductor and the field then it call it as dynamically induced emf. 3. What does speed voltage mean? It is that voltage generated ...
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... changing in the time only. This implies such an incorrect idea as the electromagnetic field energy spread through conductive parts of the electric and magnetic circuits. So in this work was demonstrated how the energy spread actually in one of the electric engine – in the transformer. The widespread ...
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Author Guidelines for ACES Journal Paper (16 pt bold)

... resonant circuit is designed for zero-current switching (ZCS) buck converter. In order to evaluate the actual behavior of the converter at the design stage, a numerical model of the inductor was created and implemented using the finite element (FE) analysis. Using the numerical model, a high frequen ...
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- Engineers Academy
- Engineers Academy

< 1 ... 89 90 91 92 93 94 95 96 97 ... 173 >

Resonant inductive coupling



Resonant inductive coupling or electrodynamic induction is the near field wireless transmission of electrical energy between two magnetically coupled coils that are part of resonant circuits tuned to resonate at the same frequency. This process occurs in a resonant transformer, an electrical component which consists of two high Q coils wound on the same core with capacitors connected across the windings to make two coupled LC circuits. Resonant transformers are widely used in radio circuits as bandpass filters, and in switching power supplies. Resonant inductive coupling is also being used in wireless power systems. Here the two LC circuits are in different devices; a transmitter coil in one device transmits electric power across an intervening space to a resonant receiver coil in another device. This technology is being developed for powering and charging portable devices such as cellphones and tablet computers at a distance, without being tethered to an outlet.Resonant transfer works by making a coil ring with an oscillating current. This generates an oscillating magnetic field. Because the coil is highly resonant, any energy placed in the coil dies away relatively slowly over very many cycles; but if a second coil is brought near it, the coil can pick up most of the energy before it is lost, even if it is some distance away. The fields used are predominately non-radiative, near fields (sometimes called evanescent waves), as all hardware is kept well within the 1/4 wavelength distance they radiate little energy from the transmitter to infinity.One of the applications of the resonant transformer is for the CCFL inverter. Another application of the resonant transformer is to couple between stages of a superheterodyne receiver, where the selectivity of the receiver is provided by tuned transformers in the intermediate-frequency amplifiers. The Tesla coil is a resonant transformer circuit used to generate very high voltages, and is able to provide much higher current than high voltage electrostatic machines such as the Van de Graaff generator. Resonant energy transfer is the operating principle behind proposed short range (up to 2 metre) wireless electricity systems such as WiTricity or Rezence and systems that have already been deployed, such as Qi power transfer, passive RFID tags and contactless smart cards.
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