6.4.1. Separate-excited direct current generator
The separately excited direct current motor is a direct current generator whose exciter winding is fed by a separate voltage source.
The induced rotor current is virtually load independent given constant rotor speed and exciter flow. Conversely, terminal voltage U drops slightly as load increases. The graphical presentation of the function U = f (I) is a declining straight.
The separately excited generator cannot be short-circuited.
Voltage - control
By means of the voltage field actuator the exciter flow can be altered from minimum to saturation value. Consequently, the induced voltage can be varied within considerable limits.
Due to the considerable voltage setting range, the separately excited generator is utilised where very different voltages are required, for instance in converters.
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