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DPE winding
The DPE winding is a coil that generates a pulse for the Field winding.
Some generators use a constant DC voltage (like from a battery or filtered DC pulses) for the Field current.
DC currents are not normally controlled with an SCR. (You have to jump through hoops}
This seems to be an advantage by using pulses of DC,
because there is probably less power loss when the cycle is going through zero.
The duration of the current is controlled by an SCR-1
The voltage regulator controls the signal to the SCR-1 and therefore controls the Field current and output voltage.
Diode D2 allows only positive voltage to go through the Field winding.
The MOV-1 across the Field winding suppresses transients.
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