Shunt motor control with current limiter

Claim 1

A MOTOR CONTROL CIRCUIT COMPRISING: (A) AN ALTERNATING CURRENT SOURCE, (B) A CONTROLLED RECTIFIER HAVING AN ANODE, A CATHODE AND A GATE, SAID ANODE BEING CONNECTED TO ONE SIDE OF SAID SOURCE, (C) A MOTOR ARMATURE WINDING CONNECTED BETWEEN SAID CATHODE AND THE OTHER SIDE OF SAID SOURCE, (D) A SATURABLE CORE REACTOR COUPLED BETWEEN SAID SOURCE AND GATE OF SAID CONTROLLED RECTIFIER, (E) A BIAS WINDING AND A CONTROL WINDING ENCIRCLING THE CORE OF SAID REACTOR, (F) A BIAS VOLTAGE SOURCE COUPLED TO SAID BAIS WINDING TO PROVIDE CURRENT THEREIN TENDING TO BIAS SAID CORE IN A DIRECTION OPPOSING CONDUCTION THROUGH SAID REACTOR FROM SAID SOURCE TO SAID GATE, (G) MEANS RESPONSIVE TO CURRENT IN SAID ARMATURE WINDING AND ADAPTED TO PROVIDE ADDITIONAL BIAS CURRENT IN SAID BIAS WINDING WHEN THE ARMATURE WINDING CURRENT EXCEEDS A PREDETERMINED LEVEL, (H) A VARIABLE REFERENCE SOURCE TO PROVIDE A VOLTAGE RELATED TO THE DESIRED MOTOR SPEED, (I) AND A RESISTOR COUPLED ACROSS THE ARMATURE WINDING AND EXHIBITING A POTENTIAL THEREON RELATED TO THE ARMATURE WINDING VOLTAGE, SAND RESISTOR AND SAID REFERENCE SOURCE BEING CONNECTED IN SERIES OPPOSITION ACROSS SAID CONTROL WINDING TO PROVIDE CURRENT THEREIN TENDING TO BIAS SAID CORE IN A DIRECTION OPPOSITE TO THE EFFECT OF SAID BIAS WINDING.