WordNet
n. the electric coil around a field magnet that produces the magneto motive force to set up the flux in an electric machine [syn: field winding]
Wikipedia
A field coil is an electromagnet used to generate a magnetic field in an electro-magnetic machine, typically a rotating electrical machine such as a motor or generator. It consists of a coil of wire through which a current flows.
In a rotating machine, the field coils are wound on an iron magnetic core which guides the magnetic field lines. The magnetic core is in two parts; a stator which is stationary, and a rotor, which rotates within it. The magnetic field lines pass in a continuous loop or magnetic circuit from the stator through the rotor and back through the stator again. The field coils may be on the stator or on the rotor.
The magnetic path is characterized by poles, locations at equal angles around the rotor at which the magnetic field lines pass from stator to rotor or vice versa. The stator (and rotor) are classified by the number of poles they have. Most arrangements use one field coil per pole. Some older or simpler arrangements use a single field coil with a pole at each end.
Although field coils are most commonly found in rotating machines, they are also used, although not always with the same terminology, in many other electromagnetic machines. These include simple electromagnets through to complex lab instruments such as mass spectrometers and NMR machines. Field coils were once widely used in loudspeakers before the general availability of lightweight permanent magnets.
Usage examples of "field coil".
There was a big field coil on the top of the van, but its gone now.
Two of the men finished disconnecting the warp field coil housing and lifted the subsection of the cylinder.
Either the smaller warp-field developed by the scout-craft will be absorbed by the Excalibur's own warp-field coil, causing an automatic shut-down sequence of your warp engines to occur or.
Beneath it is a dual tangent, full magnetopulse field coil with an artificial singularity.
But now if my hypothesis is correct, closing this switch on Brother Kornhoer's field coil here should cause a sudden brightening of the transmitted light.
But now if my hypothesis is correct, closing this switch on Brother Kornhoers field coil here should cause a sudden brightening of the transmitted light.
For the past two weeks, Caliban had been working with a team of New Law robots engaged in the refurbishment of an old windshifter force field coil, a massive, powerful, and intricate device.