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A Tesla coil is an electrical resonant transformer circuit designed by inventor Nikola Tesla in 1891. [1] It is used to produce high-voltage, low-current, high-frequency alternating-current electricity. [2] [3] Tesla experimented with a number of different configurations consisting of two, or sometimes three, coupled resonant electric circuits.
Bifilar wound toroidal transformer, also known as a common-mode choke. A different type of bifilar coil is used in some relay windings and transformers used for a switched-mode power supply to suppress back-emf. In this case, the two wire coils are closely spaced and wound in parallel but are electrically isolated from each other.
However, at points a distance of several times the winding spacing, the toroid does look symmetric. [7] There is still the problem of the circumferential current. No matter how many times the winding encircles the core and no matter how thin the wire, this toroidal inductor will still include a one coil loop in the plane of the toroid.
A standard MPP core saturates at around 0.75 Tesla. A ferrite core saturates at around 0.45 Tesla. Molypermalloy powder cores are commonly used in the making of: flyback transformers, resonant circuits, quartz filters, loading coils, choke coils, pulse transformers, and other industrial and military circuits. [1]
Nikola Tesla patented the Tesla coil circuit on April 25, 1891. [4] [5] and first publicly demonstrated it May 20, 1891 in his lecture "Experiments with Alternate Currents of Very High Frequency and Their Application to Methods of Artificial Illumination" before the American Institute of Electrical Engineers at Columbia College, New York.
Loop antenna - a coil which serves as a radio antenna, to convert radio waves to electric currents. Rogowski coil - a toroidal coil used as an AC measuring device; Musical instrument pickup - a coil used to produce the output audio signal in an electric guitar or electric bass. Flux gate - a sensor coil used in a magnetometer
An electric current through a wire wound into a coil creates a magnetic field through the center of the coil, due to Ampere's circuital law. Coils are widely used in electronic components such as electromagnets, inductors, transformers, electric motors and generators. A coil without a magnetic core is called an "air core" coil.
In toroidal SMES, the coil is always under compression by the outer hoops and two disks, one of which is on the top and the other is on the bottom to avoid breakage. Currently, there is little need for toroidal geometry for small SMES, but as the size increases, mechanical forces become more important and the toroidal coil is needed.
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