Motor speed control utilizing light sensitive conductive and resistive elements

Claim 1

A MOTOR SPEED CONTROL SYSTEM COMPRISING: A MASTER MOTOR, AT LEAST ONE DIRECT CURRENT SHUNT WOUND ELECTRIC MOTOR, REFERENCE SPEED SIGNAL PRODUCING MEANS ADAPTED TO CONTINUOUSLY PRODUCE ELECTRICAL SIGNALS CORRESPONDING TO THE SHAFT ROTATIONAL SPEED OF SAID MASTER MOTOR; AND; A BRANCH FOR EACH DIRECT CURRENT MOTOR COMPRISING CONTROL MEANS FOR CONNECTING THE DIRECT CURRENT MOTOR TO A POWER SUPPLY, SAID CONTROL MEANS INCLUDING A LIGH SENSITIVE VARIABLE SRESISTOR FOR CONTROLLING CURRENT FLOW THROUGH THE ARMATURE OF THE DIRECT CURRENT MOTOR, SPEED SIGNAL MEANS ADAPTED TO CONTINUOUSLY PRODUCE ELECTRICAL SIGNALS CORRESPONDDING TO THE SHAFT ROTATIONAL SPEED OF THE DIRECT CURRENT MOTOR, MEANS ADAPTED TO RECEIVE THE ELECTRICAL SIGNALS FROM THE AFORESAID SPEED SIGNAL MEANS AND FROM SAID REFERENCE SPEED SIGNAL PRODUCING MEANS AND PRODUCE THEREFROM AN ERROR SIGNAL CORRESPONDING TO THE DEVIATION FROM A PREDETERMINED SPEED RELATIONSHIP FOR THE DIRECT CURRENT MOTOR AND SAID MASTER MOTOR, AND, MEANS TO APPLY SAID ERROR SIGNAL TO SAID LIGHT SENSITIVE VARIABLE RESISTOR TO CHANGE THE CURRENT FLOW THROUGH SAID ARMATURE TO ACHIEVE SAID PREDETERMINED SPACED RELATIONSHIP.