6.3.1. Direct current generators
The induced voltage is determined by means of the equation U0 = c • Φ • n
Thus we derive the value of U0
1. through the construction (C)
The construction constant (C) which results from the construction of the generator take in, for example, the number of pole pairs, the number of rotor conductors and the interconnection of the rotor windings. The exciter flow can be controlled by changing the exciter winding voltage. This is possible by series connection of an alterable resistance to the exciter winding. This is called resistance strain field actuator. Exciter voltage, exciter current and excited flow are interlinked like this:
If U0 = f ((Φe)) is considered one can also investigate U0 = f (Ie) as Φe is dependent on Ie. The following diagram is forthcoming for a constant speed n (Figure 95): In the case of a lesser exciter current the curve is almost linear. The curve flattens out following increased pole iron saturation.
Figure 96 depicts the relationship between rotor speed and induced voltage U0. Thus, the original voltage can also be attained through the speed.
The induced voltage of a direct current generator can be controlled by altering the exciter current or the speed.
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