Characteristics of DC Generator: Series, Shunt, and Compound Generator

Last Updated on May 28, 2025
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Characteristics Of DC Series Generator

FAQ Related To Characteristics Of DC Generator

If the rotor speed of a DC generator is increased keeping other parameters unchanged, the slope of the OCC increases. This is because higher speed leads to increased EMF generation according to Faraday's law of electromagnetic induction.

The internal characteristic considers the effect of the armature reaction which lowers the main magnetic flux from the no-load value. Hence, the emf generated (E) on load is less than the no-load emf (E0), causing the internal curve to lie below the OCC.

The internal characteristic can be obtained by raising perpendiculars from points on the external load curve to the OCC and marking lengths along them equal to the IaRa voltage drops at those points. The points of intersection will lie on the internal characteristic curve.

If the field resistance of a shunt generator is increased beyond the critical resistance value, the generator will not be able to build up voltage during self-excitation and will fail to work.

In a separately excited DC generator, the field current and thereby the main flux can be controlled independently of the load current from an external source. Therefore, the terminal voltage remains almost constant over a wide range of loads, unlike self-excited generators whose characteristics droop noticeably.

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