Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 123
the position ofthe brushes away from the geometrical median line be-tween radii to two adjacent poles. A shifting of brushesfrom this neutral plane results in a weakening of the mag-netic field, due to the armature current in some of theconductors, and this effect is called the demagnetizingejfect.… … 51. Cross-Magnetizing Effect of Armature Current.— Consider a drum armature revolving in a bipolar magneticfield, and let the brushes be placed midway between thepoles, that is, in the neu-tral plane. When thefield magnets are excitedand the armature is run-ning on open circuit,the magnetic flux…
Electric machinery
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