Stator

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Stator

The stator is the stationary part of a rotor

Rotordynamics

Rotordynamics is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures. It is commonly used to analyze the behavior of structures ranging from jet engines and steam turbines to auto engines and computer disk storage....
system, such as in an electric generator or electric motor

Electric motor

An electric motor uses electrical energy to produce mechanical energy, nearly always by the interaction of magnetic fields and current-carrying conductors....

Depending on the configuration of a spinning electromotive device the stator may act as the field magnet, interacting with the armature

Armature (electrical engineering)

In electrical engineering, an armature generally refers to one of the two principal electrical components of an electromechanical machine - a Electric motor or Electrical generator, but may also mean the pole piece of a permanent magnet or electromagnet, or the moving iron part of a solenoid or relay....
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 dynamo

Dynamo

Dynamo or Dinamo may refer to:...
s) and DC motors

Electric motor

An electric motor uses electrical energy to produce mechanical energy, nearly always by the interaction of magnetic fields and current-carrying conductors....
put the field coils on the stator, and the power generation or motive reaction coils on the rotor.

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Encyclopedia

The stator is the stationary part of a rotor

Rotordynamics

Electric motor

Armature (electrical engineering)

Dynamo

Dynamo or Dinamo may refer to:...
s) and DC motors

Electric motor

Commutator (electric)

A commutator is an electricity switch that periodically reverses the Current direction in an electric motor or electrical generator. A commutator is a common feature of direct current rotating machines....
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

Magnet

A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials and attracts or repels other magnets....
or an electromagnet

Electromagnet

An electromagnet is a type of magnet in which the magnetic field is produced by the flow of electric Current . The magnetic field disappears when the current ceases....
. Where the stator is an electromagnet, the coil which energizes it is known as the field coil or field winding.

An AC alternator

Alternator

An alternator is an generator that converts mechanical energy to alternating current electrical energy. Most alternators use a rotating magnetic field but linear alternators are occasionally used....
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

Slip ring

A slip ring is a method of making an electricity connection through a rotating assembly. Slip rings, also called rotary electrical interfaces, rotating electrical connectors, collectors, swivels or electrical rotary joints, are commonly found in electrical generators for alternating current systems and alternators and in packaging machinery,...
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.

Stator

See also