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winding

Winding

Stan Zurek, Winding, Encyclopedia Magnetica, E-Magnetica.pl

Winding or coil - a length of wire or conductor wound in a specific shape, in order to achieve specific magnetic, electric or electromagnetic properties of such configuration.

Windings on a toroidal core

Each loop of a winding is known as a turn, and the number of turns is one of the basic characteristics of a winding. In some literature1) (especially older publications2)) the “turns” are referred to as “coils”, which can be confusing.

In majority of designs the turns must be electrically isolated from each other, as well as from the rest of the device (e.g. magnetic core and the surrounding medium). However, in some applications this is not required (e.g. in squirrel cage rotors of induction motors and shaded-pole motors).

The conductor in a power-related winding is typically required to carry a substantial amount of electric current (e.g. for generation of magnetic field), so it has to have a sufficient cross-section area. Conversely, sensing coils might carry only very small signal, so they can be made from very thin conductors.

The word “winding” also means “the process of winding”, and for example there are magnetic cores wound from a magnetic sheet, tape or ribbon so they are referred to as wound cores. Obviously, this is a separate meaning, not directly related to the electrical coil as given in the main definition.

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Types of windings

There is a plethora of different types of windings used in practice, for a multitude of purposes.3) For example, the windings are optimised to:

Winding in a magnetic circuit
Types of windings: 1 - ordinary helical, 2 - bifilar, 3 - on a flat former, 4 - Ayrton-Perry
In induction motor the stator has typically wound copper coils and the rotor is made with cast aluminium “windings” stator_and_rotor_of_induction_motor_magnetica.jpg
Winding in an autotransformer variac_brush_magnetica.jpg
Water-cooled coil for induction heating induction_heating_of_bar_commons.jpg by Vector1 nz, CC-BY-SA-3.0
Winding in a large electromagnet electromagnet_200mm_by_magneto.jpg
Copper winding in a relay x-default
Windings on the rotor of a synchronous generator: main windings around the salient poles (in the middle) and exciter winding (on the right) synchronous_stator_magnetica.jpg
Winding made from a copper enamelled wire around a cylindrical ferrite core to make a choke
Current transformer with a primary (thick bar) and secondary winding droop_ct_-_magnetica.jpg Copyrights © Jiangyin Spark Electronic Company
Electronic transformer with an additional winding of an external shorted turn (flux band) for electromagnetic shielding transformer_flux_band_magnetica.jpg
Anti-theft security tag with an antenna coil made out of conductive foil S. Zurek, Encyclopedia Magnetica
Winding in a current sensor (Rogowski coil)
Winding in a fluxgate sensor fluxgate_magnetometer_commercial.jpg
Winding made as tracks on a PCB pcb_h-coil_overview.jpg

See also

References

winding.txt · Last modified: 2021/04/17 09:21 by stan_zurek

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