Circuit Operation

The generator consists of a delta-stator, rectifier bridge, and rotor with slip rings and brushes. A conventional pulley and fan are used to cool the slip ring end frame, rectifier bridge and regulator. The voltage regulator limits the system voltage by controlling the rotor field current. While the field current is ON, the regulator switches the field current ON and OFF at a frequency of 400 cycles per second. By varying the overall ON-OFF time, the correct average field current for proper system voltage is obtained. At high Speeds with low electrical loads, the on-time may be 10% and the off-time may be 90%. At low speeds with high electrical loads, the ON-OFF time may be 90% and 10%, respectively.