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 63
,and in the fact that since the field current is small, there is but littleenergy wasted and little heat to dissipate from the rheostat. Further, 49 40 DIRECT-CURRENT MOTORS the speed is adjustable by small steps. The disadvantage of themethod arises from the fact that the field must not be… … Fig. 33. Variable-Speed Motor.Stow Manufacturing Co., Binghamton, N. Y. heavier field-magnet must be provided; for example, for a 2 to 1variation, a 15-horse-power frame should be used for a 10-horse-power motor, while a 3 to 1 variation requires a 20-horse-powerframe for a 10-horse-power motor,…
Electrical engineering
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