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In engineering, a solenoid is a device that converts electrical energy to mechanical energy, using an electromagnet formed from a coil of wire. The device creates a magnetic field [ 1 ] from electric current , and uses the magnetic field to create linear motion.
A solenoid (/ ˈ s oʊ l ə n ɔɪ d / [1]) is a type of electromagnet formed by a helical coil of wire whose length is substantially greater than its diameter, [2] which generates a controlled magnetic field. The coil can produce a uniform magnetic field in a volume of space when an electric current is passed through it.
A variable force solenoid (VFS) is an electro-hydraulic device that controls pressure proportionally or inversely proportionally to a signal (voltage or current) obtained from the on-board controller of a powertrain. A low flow VFS is used as a signal level devices for transmission line pressure control or application of clutches.
Turns refers to the winding number of an electrical conductor composing an electromagnetic coil. For example, a current of 2 A flowing through a coil of 10 turns produces an MMF of 20 A⋅t . The corresponding physical quantity is NI , the product of the number of turns , N , and the current, I ; it has been used in industry, specifically, US ...
In the case of solenoid coils, the height or length is also smaller for HTSC coils, but still much higher than in a toroidal geometry (due to low external magnetic field). An increase in peak magnetic field yields a reduction in both volume (higher energy density) and cost (reduced conductor length).
The design or interpretation of the required space of an orthocyclic winding is usually realized by applying an iterative approach. At first, the specified parameters of the required number of windings, the required wire cross section and the maximum space available for an insulated coil are used for the calculation basis.
For solenoid coils adding more turns to the coil will enhance the B 1 /i ratio and thus both the inductance and the signal response. At the same time the coil resistance will increase linearly, so the improvement in sensitivity will be proportional to the square root of the number of turns (n).
A solenoid is a long, thin coil; i.e., a coil whose length is much greater than its diameter. Under these conditions, and without any magnetic material used, the magnetic flux density B {\displaystyle B} within the coil is practically constant and is given by B = μ 0 N i ℓ {\displaystyle B={\frac {\mu _{0}\,N\,i}{\ell }}}
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