page_title: Stator
section_title: In motors
hierarchical_section_title: Stator / In motors
caption_attribution_description: English: Stator winding of No.2 Generator, Wimalasurendra Power Station, Sri Lanka.
context_page_description: The stator is the stationary part of a rotary system, found in electric generators, electric motors, sirens, mud motors or biological rotors. Energy flows through a stator to or from the rotating component of the system. In an electric motor, the stator provides a rotating magnetic field that drives the rotating armature; in a generator, the stator converts the rotating magnetic field to electric current. In fluid powered devices, the stator guides the flow of fluid to or from the rotating part of the system.
context_section_description: Depending on the configuration of a spinning electromotive device the stator may act as the field  magnet, interacting with the armature to create motion, or it may act as the armature, receiving its influence from moving field coils on the rotor.
  The first DC generators (known as dynamos) and DC motors put the field coils on the stator, and the power generation or motive reaction coils on the rotor. This is necessary because a continuously moving power switch known as the commutator is needed to keep the field correctly aligned across the spinning rotor. The commutator must become larger and more robust as the current increases.
  The stator of these devices may be either a permanent magnet or an electromagnet.  Where the stator is an electromagnet, the coil which energizes it is known as the field coil or field winding.
  The coil can be either iron core or aluminum. To reduce loading losses in motors, manufacturers invariably use copper as the conducting material in windings. Aluminum, because of its lower electrical conductivity, may be an alternate material in fractional horsepower motors, especially when the motors are used for very short durations.
  An AC alternator is able to produce power across multiple high-current power generation coils connected in parallel, eliminating the need for the commutator. Placing the field coils on the rotor allows for an inexpensive slip ring mechanism to transfer high-voltage, low current power to the rotating field coil.
  It consists of a steel frame enclosing a hollow cylindrical core (made up of laminations of silicon steel). The laminations are to reduce hysteresis and eddy current losses.
caption: Stator winding of a generator at a hydroelectric power station.
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