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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|See also: List of types of windings and coils.|
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: