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 264
es onfreight elevators, connecting the solenoid with the armature of themotor through special resistances so arranged that with light loadsthe solenoid is not energized, but under heavy loads the e. m. f. inthe armature becomes great enough to move the plunger in the sole-noid, which then operates… … Fig. 136. Variable-Speed Full Magnet ControllerCourtesy of Kaestner and Ilecht Company slower speed—the field resistance is always in, except when thesolenoid is energized. The effect of this arrangement is to produce 231 182 ELEVATORS a fairly high speed with comparatively light loads; while with…
Electrical engineering
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