. A text-book of electrical engineering;. eover, thearmature resistance is not constant, but increases with its temperature and 57- Characteristics of Separately-excited Dynamo 173 therefore with the load. It is hardly possible, however, to take these pointsinto consideration in a simple manner. Another disturbing influence, whichwe have neglected and which we shall continue to neglect, is the effect ofremanent magnetism. 58. Characteristics of Series Dynamo. Both the consideration and the actual working of a separately exciteddynamo are extremely simple, since with constant speed and constant
. A text-book of electrical engineering;. eover, thearmature resistance is not constant, but increases with its temperature and 57- Characteristics of Separately-excited Dynamo 173 therefore with the load. It is hardly possible, however, to take these pointsinto consideration in a simple manner. Another disturbing influence, whichwe have neglected and which we shall continue to neglect, is the effect ofremanent magnetism. 58. Characteristics of Series Dynamo. Both the consideration and the actual working of a separately exciteddynamo are extremely simple, since with constant speed and constantexcitation the electromotive force is independent of changes in the externalcircuit. The behaviour of self-excited dynamos is, however, far more com-plicated, since every change in the external circuit affects the magnetisingcurrent, and also, therefore, the magnetic flux and the electromotive force. The relations are, perhaps, simplest in the series dynamo, since thearmature current is here identical with the magnetising current and the.
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