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 60
speed is easilyobtained by simply inserting a suitable resistance in the armaturecircuit, as indicated by R, Fig. 30, leaving the field circuit FF un-changed. The amount of resistance inserted in order to obtain thedesired speed and torque can be calculated in several ways. Example. A certain… … 47 38 DIRECT-CURRENT MOTORS Solution. In Equation 7 (page 17), E - IR ^ kfz R includes not only the armature resistance, but any other resistancethat may be in series with it. At full speed there is no resistancein the armature circuit, except that of the armature itself; and thisis negligible in…
Electrical engineering
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