Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 352
with theminimum current, see page 102. In addition, it takes light loadsat a high speed and heavy loads at a slow speed, slows down on anup grade and speeds up on a down grade, it therefore maintainsthe load on the power house more uniform than if constant speedmotors such as the direct-current… … Armature/nterpoles Fig. 390.—Direct-current street railway motor,expensive, has a lower efficiency and does not commutate so well.The method of control is simpler however, the low voltage re-quired for starting being obtained by means of an autotrans-former instead of by the use of resistance and…
Electrical engineering
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