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An Introduction to Kinetic Inductance Detectors
An Introduction to Kinetic Inductance Detectors

... The normal state conductivity (σ1) due nn, reduces rapidly as we cool from Tc were as σ2 increases. The preferred AC current path shift to σ2 as we move towards T=0. DC resistance is always zero as any resistive path from σ1 is shorted by the infinite conductivity of σ2 if ω=0 ...
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... The principle of the transformer can be utilized with only one winding instead of two; the principles just discussed apply equally well to the earlier transformers as well. A single winding transformer is called an autotransformer (Fig. 3.11). The current in the common section of the winding is diff ...
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... between the capacitor plates, the wire of an inductor provides an unbroken continuous path in which current can flow. When the current in a circuit is constant, an inductor acts essentially like a short circuit (i.e., a zero-resistance path). In reality, there is always at least a small amount of re ...
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... Abstract: Recently, interior permanent magnet synchronous motors (Interior-PMSMs) have become known as a good candidate for hybrid electric vehicle (HEV) traction drive application due to their unique merits. However, the dynamic and steady-state behaviors of these motors are quite dependent on the ...
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... EMF is fundamentally an electro-thermo-mechanical process [16]. Different coupling strategies have been proposed to solve numerically this multiphysics problem, but they can be reduced to these three categories: direct or monolithic coupling, sequential coupling and loose coupling. In all of them, ...
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... All existing interphase transformers must be replaced because the rectifiers are being upgraded to higher voltage and current ratings. All new 6-pulse interphase transformers will be a direct physical replacement for the existing units, except for higher voltage and current ratings. The two unconven ...
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... nearly zero so you would think that you would measure zero volts across the inductor. However, these inductors have ~1 km of wire and therefore some small resistance so at low frequencies you may ...
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... which means that the induced current will be clockwise. If the wire loop is stationary but the current in the wire is decreased, then the inward magnetic field through the loop will again be decreasing, so again the induced current will be clockwise. There will be no magnetic field lines “piercing” ...
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... of turns of each coil. M does not depend on the current. It is possible to orient the two coils so that M is zero. In this experiment the EMF induced in one coil by a changing current in another coil will be investigated. If the coils are moved with respect to each other the mutual inductance M will ...
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Magnetic core

A magnetic core is a piece of magnetic material with a high permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies. It is made of ferromagnetic metal such as iron, or ferrimagnetic compounds such as ferrites. The high permeability, relative to the surrounding air, causes the magnetic field lines to be concentrated in the core material. The magnetic field is often created by a coil of wire around the core that carries a current. The presence of the core can increase the magnetic field of a coil by a factor of several thousand over what it would be without the core.The use of a magnetic core can enormously concentrate the strength and increase the effect of magnetic fields produced by electric currents and permanent magnets. The properties of a device will depend crucially on the following factors: the geometry of the magnetic core. the amount of air gap in the magnetic circuit. the properties of the core material (especially permeability and hysteresis). the operating temperature of the core. whether the core is laminated to reduce eddy currents.In many applications it is undesirable for the core to retain magnetization when the applied field is removed. This property, called hysteresis can cause energy losses in applications such as transformers. Therefore, 'soft' magnetic materials with low hysteresis, such as silicon steel, rather than the 'hard' magnetic materials used for permanent magnets, are usually used in cores.
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