stator n : mechanical device consisting of the stationary part of a motor or generator in or around which the rotor revolves [syn: stator coil] [ant: rotor]

English

Noun

1. The stationary part of a motor or other machine.

Translations

• Finnish: staattori

Related terms

• rotor

The stator is the stationary part of an electric generator or electric motor. The non-stationary part on an electric motor is the rotor.

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 are on the rotor. This was 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 power amperage 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.

AC alternators are able to produce power across multiple high-amperage 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 amperage 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.

See also

• Commutator (electric)
• Armature (electrical engineering)
• Electric motor