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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 85

An illustration from 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, leaf 85
featuresfor sparkless operation, allows ofbetter ventilation, and is undoubtedly much cheaper. The interpoleor more complicated compensating windings are not generally em-ployed upon ordinary large machines. They are particularly impor-tant, however, as regards high-speed turbine outfits, railway… … Fig. 79. M. E. Thompsons Device toPrevent Sparking 69 60 DIRECT-CURRENT DYNAMOS ing the volts between the commutator segments relatively low—2 to4 volts—employing high-flux densities in the teeth (20,000 to 23,000Z of / per sq. cm.), and providing the poles with tips or shoes tocarry the flux well…

Electrical engineering

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