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 251
t used to be contended that a slow speed motorwas not so efficient as those of higher speed, but as the question ofdesign has been more thoroughly in^•estigated and understood, theseobjections have all been overcome. In fact, such a degree of per-fection in the design of motors for elevator service… … 1-1O O H >>-) p:iMO ^^ en e o O a, 1^ -5H S O § Si 2o ELEVATORS 169 MODERN TYPESInterpole Motors. For variable speed elevators a type calledthe Interpolar JVlotor is now in general use. This motor, as itsname would indicate, is a direct-current motor with additional polesand field windings…
Electrical engineering
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