Shunt motor control circuit

Claim 1

IN POWER SUPPLY APPARATUS: (A) AN A.C. SOURCE, (B) A CONTROLLED RECTIFIER HAVING AN ANODE, A CATHODE AND A GATE, (C) A VARIABLE LOAD CONNECTED IN SERIES WITH SAID A.C. SOURCE AND THE ANODE AND CATHODE OF SAID CONTROLLED RECTIFIER, (D) A SATURABLE CORE REACTOR COUPLED BETWEEN SAID A.C. SOURCE AND THE GATE OF SAID CONTROLLED RECTIFIER, (E) A BIAS WINDING AND A CONTROL WINDING ENCIRCLING THE CORE OF SAID REACTOR, COUPLED TO SAID BIAS WINDING CORE OF SAID REACTOR, (F) A BIAS VOLTAGE SOURCE COUPLED TO SAID BIAS WINDING CORE IN A DIRECTION OPPOSING CONDUCTION THROUGH SAID REACTOR FROM THE A.C. SOURCE TO THE GATE, (G) A VARIABLE REFERENCE VOLTAGE SOURCE ADAPTED TO PROVIDE A REFERENCE VOLTAGE RELATED TO A SELECTED LOAD VOLTAGE, (H) RESISTANCE MEANS COUPLED ACROSS SAID LOAD AND EXHIBITING A POTENTIAL RELATED TO THE ACTUAL LOAD VOLTAGE, (I) AND CONDUCTIVE MEANS CONNECTING SAID REFERENCE VOLTAGE SOURCE AND SAID RESISTANCE MEANS IN SERIES OPPOSITE ACROSS SAID CONTROL WINDING, THE REFERENCE VOLTAGE BEING POLED TO BIAS SAID CORE IN A DIRECTION OPPOSITE TO THE EFFECT OF SAID BIAS WINDING.