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Voltage Regulator 1
The voltage regulator helps to reach the operating voltage with as few as possible heat losses already at idling speed and to keep it in every working condition of the engine steady.
How it works
It is hardly considered to be a single component, because it is mostly fastened to the brush holder in the generator. This comes about, because all functions are grouped into one electronic component (chip, IC).
A transistor circuit controls the field winding in the rotor using the current delivered by the exciter diodes of the generator and/or the battery according to the tension. A constant high tension of about 14 volts (truck: 28
volts) is generated and kept, turning on and off the exciting current, practically without inertia. The switching of high exciting currents delivers heat which is conducted via the metal foot. Together with the diodes it is
cooled by an extra fan attached in the rear of the generator.
The diagram (figure) shows the curve of the generator voltage (gray) and the field current (red) at relatively low loads. Shortly about the idling speed of the generator the field current must clearly be taken back by
increased switching off, thus the generator voltage does not exceed the 14 volts.