This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ... volts; 1.5 amp. when the voltage is 75 volts, and 1 amp. when the voltage is 50 volts. This relation is shown in Curve II, Fig. 234. Curve 1 shows the resistance line for 80ohms field resistance. It will be noted that at 80 volts the current is 1.0 amp., at 40 volts it is 0.5 amp., etc. Curve III shows the same ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ... volts; 1.5 amp. when the voltage is 75 volts, and 1 amp. when the voltage is 50 volts. This relation is shown in Curve II, Fig. 234. Curve 1 shows the resistance line for 80ohms field resistance. It will be noted that at 80 volts the current is 1.0 amp., at 40 volts it is 0.5 amp., etc. Curve III shows the same relation for a field resistance of 40 ohms. It will be noted that the higher the resistance the greater the lope of the resistance line. In fact the slope of the line is equal Fig. 234.--Field resistance lines. to the field resistance in ohms since the tangent, of the angle which El the line makes with the axis of abscissae is, . Fig. 235.--Shunt generator connections. 187. Types of Generators.--There are three general types of generator in common use, the shunt, the compound and the series. In the shunt type the field circuit is connected across the armature terminals, usually in series with a rheostat, Fig. 235. The shunt field, therefore, must have a comparatively high resistance in order that it may not take too great a proportion of the generator current. The compound generator is similar to the shunt, but has an additional field winding connected in series wth the armature or load, Fig. 270. The series generator is excited entirely by a winding of comparatively few turns connected in series with the armature and load. 0 6'd'.6 TO O 2.0 2l 10 3.5 4.0 O 67b Field Current Fig. 236.--Method of shunt generator building up. 188. The Shunt Generator.--Fig. 236 shows the saturation curve of a shunt generator and its shunt field resistance line drawn on the same plot. This field, it will be observed, has a resistance of 24 ohms, so that at 120 volts it takes 5 amp.; at 60 volts 2.5 amp.; etc. At the instant of starting a generator the induced voltage is...
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