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 64
eater speed variations, special constructions are used, whichwill be described later, Fig. 43 (page 52) shows an adjustable-speed motor giving a 3 to 1 variation in speed by variation of fieldresistance. Apart from the extra size of the motor, speed control by thissystem is very satisfactory where… … Pig. 33A. Sectional Views of Variable-Speed Motor Shown in Fig. 32. the field current is kept constant. Advantage of this is taken in themotor illustrated in Fig. 32. In this machine the field cores andpoles are hollow and provided with iron plungers, which can bemoved toward the armature or away…
Electrical engineering
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