Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 88
per sq.in.), they oppose the shifting of the lines byarmature reaction. The disadvantages of toothed arma-ture cores are: they cost more; theymay produce eddy-current losses in thepolar faces; and they increase armatureself-induction. The element of cost is ofno account, however, when the… … Fig. 88. Section of SlottedArmature 72 PRINCIPLES 63 1. Armature-resistance drop producing PR effects. 2. Friction of bearings and brushes. 3. Air-friction of the rotating armature. 4. Hysteresis in the armature core. 5. Eddy-currents in the armature core, conductors, and polar pro-jections. 6.…
Electrical engineering
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