Magnetic fields require a continuous circuit, thus more than one pole. 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.
Other articles related to "field coil, coils, field coils":
... Coils are typically wound with enamelled copper wire, sometimes termed magnet wire ... resistance, to reduce the power consumed by the field coil, but more importantly to reduce the waste heat produced by ohmic heating ... to build highly-efficient low-resistance field coils for their magnets ...
Famous quotes containing the word field:
“Hardly a book of human worth, be it heavens own secret, is honestly placed before the reader; it is either shunned, given a Periclean funeral oration in a hundred and fifty words, or interred in the potters field of the newspapers back pages.”
—Edward Dahlberg (19001977)