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Currents caused by changing magnetic fields produced in armature and field cores of electrical machines that tend to interfere with the production of emf in the armature windings.

Related Terms

ARMATURE DEMAGNETIZATION

The reduction in the effective magnetic lines of force, produced by the armature current.

ARMATURE DEMAGNETIZATION

The reduction in the effective magnetic lines of force, produced by the armature current.

AIR GAP

The space between magnetic poles, or between the rotating and stationary assemblies in a motor or generator.

HALVING

The process of adjusting magnetic compass correctors so as to remove half of the deviation on the opposite cardinal or adjacent intercardinal headings to those on which adjustment was originally made when all deviation was removed. This is done to equalize the error on opposite headings.

HEELING MAGNET

A permanent magnet placed vertically in a tube under the center of a marine magnetic compass, to correct for heeling error.

GRID MAGNETIC ANGLE

Angular difference in direction between grid north and magnetic north. It is measured east or west from grid north. Grid magnetic angle is sometimes called GRID VARIATION or GRIVATION.

ARMATURE COIL

The loop or coil of copper wire, placed on the armature core, and forming part of the winding.

ARMATURE

the rotating part of an electric motor or generator. The moving part of a relay or vibrator.

ARMATURE VARNISH

Is a liquid put on the field and armature windings, to improve the insulation of the cotton covering on the wires.

ARMATURE SLOT

The groove or slot in the armature core, into which the coils or windings are placed.
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