Armature, Drum.
An armature for a dynamo or motor, consisting of a cylinder of iron
preferably made up of discs insulated from each other by thin shellacked
paper, or simply by their oxidized surfaces, and wound with wire
parallel to the axis where it lies on the cylindrical periphery and
crossing the heads approximately parallel to the diameter. It operates
practically on the same principle as a Gramme Ring Armature. (See Gramme
Ring.)
Synonym--Cylindrical Armature.
Armature Factor.
The number of conductors on an armature, counted or enumerated all
around its external periphery.
Armature, Hinged.
An armature pivoted to the end of one of the legs of an electro-magnet
so as to be free to swing and bring its other end down upon the other
pole.
Fig. 26. HINGED ARMATURES OF CLUB-FOOT ELECTRO MAGNETS.
Armature, Hole.
An armature whose core is perforated to secure cooling.
Synonym--perforated Armature.
Armature, Intensity.
An armature wound for high electro-motive force. A term little used at
the present time.
Armature Interference.
A limit to the ampere turns permissible on a given armature is found in
the increase of cross magnetizing effect, q. v., the increased lead
necessitated, and the growth of the demagnetizing power. All such
perturbing effects are sometimes expressed as armature interference.