System of voltage and current regulation for rotary generators

Claim 1

A CONTROL SYSTEM FOR A SHUNT-WOUND ELECTRICAL GENERATOR HAVING AN ARMATURE WINDING, A FIELD EXCITATION WINDING AND A LOAD CIRCUIT CONNECTED THERETO, SAID GENERATOR BEING SUBJECT TO SUBSTANTIAL TERMINAL VOLTAGE CHANGES DURING OPERATION, SAID SYSTEM COMPRISING A TRANSISTOR AMPLIFIER HAVING AN INPUT BASE CIRCUIT AND AN EMITTERCOLLECTOR OUTPUT PATH CONNECTED IN SERIES WITH SAID FIELD WINDING, A MAGNETICALLY CONTROLLED RESISTOR CONNECTED IN SAID BASE CIRCUIT HAVING A RESISTANCE INCREASING IN PROPORTION TO THE STRENGTH OF A BIASING MAGNETIC FIELD CONTROLLING THE SAME, A FIRST MAGNETIC CONTROL WINDING FOR SAID RESISTOR CONNECTED TO SAID GENERATOR TO BE EXCITED BY A CURRENT PROPORTIONAL TO THE TERMINAL VOLTAGE OF SAID GENERATOR AND HAVING A DIRECTION SUCH AS TO INCREASE THE CURRENT THROUGH SAID FIELD WINDING UPON A DECREASE OF THE GENERATOR TERMINAL VOLTAGE, AND VICE VERSA, A BREAKDOWN JUNCTION DIODE HAVING A PREDETERMINED CRITICAL VOLTAGE IN SERIES WITH SAID CONTROL WINDING TO EFFECT A CURRENT FLOW THROUGH SAID CONTROL WINDING UPON SAID TERMINAL VOLTAGE EXCEEDING SAID CRITICAL VOLTAGE AND TO INTERRUPT THE CURRENT THROUGH SAID CONTROL WINDING UPON SAID TERMINAL VOLTAGE DECREASING BELOW SAID CRITICAL VOLTAGE, WHEREBY TO MAINTAIN A CONSTANT OPERATING TERMINAL VOLTAGE OF SAID GENERATOR EQUAL TO SAID CONTROL VOLTAGE, A FIXED RESISTOR IN SERIES WITH SAID LOAD CIRCUIT, A FORWARD BIASED FUNCTION DIODE, A SECOND MAGNETIC CONTROL WINDING FOR SAID FIRST RESISTOR BEING CONNECTED TO SAID FIXED RESISTOR IN SERIES WITH SAID LAST-MENTIONED DIODE, TO PREVENT A CURRENT FLOW THROUGH SAID LAST CONTROL WINDING FOR LOAD CURRENTS LESS THAN A PREDETERMINED LIMIT VALUE AND TO CAUSE A SUBSTANTIAL CURRENT FLOW THERETHROUGH IN A DIRECTION TO REDUCE THE MAGNETIC FIELD PRODUCED BY SAID FIRST CONTROL WINDING UPON THE LOAD CURRENT EXCEEDING SAID LIMIT VALUE.