armature (redirected from armatures)

armature, in art: see sculpture.

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armature

1. a revolving structure in an electric motor or generator, wound with the coils that carry the current

2. any part of an electric machine or device that moves under the influence of a magnetic field or within which an electromotive force is induced

3. a soft iron or steel bar placed across the poles of a permanent magnet to close the magnetic circuit

4. such a bar placed across the poles of an electromagnet to transmit mechanical force

5. Sculpture a framework to support the clay or other material used in modelling

6. the protective outer covering of an animal or plant

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armature [′är·mə‚chər]

(architecture)

Framing or bars fashioned of structural ironwork and used to reinforce various features, for example, slender columns or hanging members.

(electromagnetism)

That part of an electric rotating machine that includes the main current-carrying winding in which the electromotive force produced by magnetic flux rotation is induced; it may be rotating or stationary.

The movable part of an electromagnetic device, such as the movable iron part of a relay, or the spring-mounted iron part of a vibrator or buzzer.

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Armature

That part of an electric rotating machine which includes the main current-carrying winding. The armature winding is the winding in which the electromotive force (emf) produced by magnetic flux rotation is induced. In electric motors this emf is known as the counterelectromotive force.

On machines with commutators, the armature is normally the rotating member. On most ac machines, the armature is the stationary member and is called the stator. The core of the armature is generally constructed of steel or soft iron to provide a good magnetic path, and is usually laminated to reduce eddy currents. The armature windings are placed in slots on the surface of the core. On machines with commutators, the armature winding is connected to the commutator bars. On ac machines with stationary armatures, the armature winding is connected directly to the line. See Core loss, Windings in electric machinery