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 288
e into theshop, and groove out the mica between the commutator bars for adepth of about eV inch below the commutator surface. This groov-ing Is found to be very beneficial also as a general practice. It greatlyImproves the whole operation of the commutator and brushes. A greenish flash which… … Fig. 140. Diagram Showing the Effect of Open-Circuited Coil Causing Sparking at theCommutator 251 155 ELECTRIC RAILWAYS The magnetic field may be weakened by a short-circuit in thefield coils, as before explained, and this may gi^e rise to sparking. Short-circuits in the armature may give rise to…
Electrical engineering
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