lecture notes on electrical technology –r15
... An electric generator or electric motor consists of a rotor spinning in a magnetic field. The magnetic field may be produced by permanent magnets or by field coils. In the case of a machine with field coils, a current must flow in the coils to generate the field, otherwise no power is transferred to ...
... An electric generator or electric motor consists of a rotor spinning in a magnetic field. The magnetic field may be produced by permanent magnets or by field coils. In the case of a machine with field coils, a current must flow in the coils to generate the field, otherwise no power is transferred to ...
ERMCO Components
... not have interrupting rating. They are coordinated to operate at high current levels that are typical of a transformer failure. When a transformer failure occurs, the Isolation Link will melt so that the opened primary circuit of a faulted transformer cannot be reenergized by the line crew. The isol ...
... not have interrupting rating. They are coordinated to operate at high current levels that are typical of a transformer failure. When a transformer failure occurs, the Isolation Link will melt so that the opened primary circuit of a faulted transformer cannot be reenergized by the line crew. The isol ...
AVX Highlights Technology & Application Solutions at a Glance Committed to excellence
... Industries. Customers in areas such as telecommunications, information technology hardware, automotive electronics, medical devices and instrumentation, industrial instrumentation and consumer electronics. AVX Corporation is a leading worldwide manufacturer and supplier of a broad line of passive el ...
... Industries. Customers in areas such as telecommunications, information technology hardware, automotive electronics, medical devices and instrumentation, industrial instrumentation and consumer electronics. AVX Corporation is a leading worldwide manufacturer and supplier of a broad line of passive el ...
magnetizing current effect minimization in current transformers
... the system occurred to work properly and according to theoretical assumptions. Constructed double-core current transformer operates at high precision. The lowest value of current transformer’s error was obtained at –0,04 min level. That makes it a device of approximately 0,005 accuracy level for det ...
... the system occurred to work properly and according to theoretical assumptions. Constructed double-core current transformer operates at high precision. The lowest value of current transformer’s error was obtained at –0,04 min level. That makes it a device of approximately 0,005 accuracy level for det ...
In this discussion we cover 27MHz transmitters and receivers
... aeroplanes, walkie talkies and some of the older-style garage door openers. We have provided a number of circuits so you can work out the best type for your application and these circuits will also help you understand which components are critical and which components can be changed. It's a matter o ...
... aeroplanes, walkie talkies and some of the older-style garage door openers. We have provided a number of circuits so you can work out the best type for your application and these circuits will also help you understand which components are critical and which components can be changed. It's a matter o ...
Ch01
... (voltage and current; sometimes the number of phases). Its operation is based on the the electromagnetic induction phenomenon associated with time–varying electromagnetic quantities (in particular, harmonic time–varying quantities). The simplest electric transformer consists in a magnetic circuit wh ...
... (voltage and current; sometimes the number of phases). Its operation is based on the the electromagnetic induction phenomenon associated with time–varying electromagnetic quantities (in particular, harmonic time–varying quantities). The simplest electric transformer consists in a magnetic circuit wh ...
Magnetics Guide Application Note VPPD-01740
... information in this document, including descriptions of features, functions, performance, technical specifications and availability, is subject to change without notice at any time. While the information furnished herein is held to be accurate and reliable, no responsibility will be assumed by Vites ...
... information in this document, including descriptions of features, functions, performance, technical specifications and availability, is subject to change without notice at any time. While the information furnished herein is held to be accurate and reliable, no responsibility will be assumed by Vites ...
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.