Thomälen, Adolf, 1865-, Thomälen Adolf. Kurzes Lehrbuch der Electrotechnik. English · London, E. Arnold · leaf 201
areobtained in a very ingenious manner. Fig. 171 represents a 2-pole machine.The yoke and the pole-cores are very small, but the pole-shoes are abnor-mally large. The field coils // are connected across the battery and thuscarry a constant exciting current which makes the lower pole south and… … 6i. Constant-current Variable-speed Dynamos 187 of maximum p.d. and are short-circuited. The reason for making the pole-cores so small is now obvious, since a very small flux will suffice, even at alow speed, to produce the small e.m.f. required to drive the normal currentthrough the…
Electrical engineering
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