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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 the field current flows. In a rotating machine, the field coils are wound on an iron magnetic core which
They may be used alone or to replace a recuperative heat system or to replace a steam coil. In particular, this article describes the combustion air preheaters used in large boilers found in thermal power stations producing electric power from e.g. fossil fuels , biomass or waste .
The DC generator generates a small amount of electricity, just enough to excite the field coils of the connected alternator to generate electricity. A variation of this system is a type of alternator that uses direct current from a battery for initial excitation upon start-up, after which the alternator becomes self-excited.
In a separately excited (sepex) motor, the field coils are supplied from an independent source, such as a motor–generator, and the field current is unaffected by changes in the armature current. The sepex system was sometimes used in DC traction motors to facilitate control of wheelslip .
Samuel Wheelhouse is a young British inventor and engineer. His work includes the AutoDock and Man Overboard! systems. Autodock was designed in 2010. [1] It was designed to aid the docking of large ships and yachts using a combination of thrusters and sensors. The following year Wheelhouse also developed Man Overboard. [2]
Building, owning and operating a power plant to plug fusion power into the grid is its “next act,” Mumgaard said. The startup looked at more than 100 locations around the world for the power ...
Since poles and coils are equally spaced and the locations of the poles match to the locations of the coils, the magnetic lines of force are cut at the same amount at any degree of the rotor. As a result, the voltages induced to all windings have the same value at any given time. The voltages from both coils are "in phase" to each other ...
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