Infinite speed ratio stationary control system for induction type motors

Claim 1

A CONTROL SYSTEM FOR POLYPHASE ALTERNATING CURRENT ELECTRIC MOTOR AND CONNECTABLE TO A POLYPHASE SOURCE OF ELECTRICAL POWER AND COMPRISING IN COMBINATION: A POWER MODULATOR CONNECTING POWER FROM THE POWER SOURCE TO THE MOTOR WHICH CONSTITUTES FREQUENCY MULTIPLIERS HAVING SATURABLE CORES WITH POWER INPUT WINDINGS, POWER OUTPUT WINDINGS AND CONTROL CURRENT WINDINGS FOR AFFECTING THE STATE OF SATURATION OF THE CORES, SAID POWER INPUT WINDINGS BEING JOINED TO ONE ANOTHER FOR CONNECTION TO A POLYPHASE SOURCE AND SAID POWER OUTPUT WINDINGS BEING JOINED TO ONE ANOTHER WITH POLYPHASE OUTPUT TERMINALS FOR CONNECTION TO SAID MOTOR; A CONTROL CURRENT SOURCE CONNECTED TO SAID CONTROL CURRENT WINDINGS FOR CONTROLLING SATURATION OF SAID CORES, THEREBY TO CONTROL THE POWER SUPPLIED TO SAID MOTOR; AND MEANS REVERSING THE PHASE SEQUENCE OF THE OUTPUT OF SAID POWER MODULATOR UPON REVERSAL OF THE DIRECTION OF SAID CONTROL CURRENT, THEREBY TO EFFECT A REVERSAL OF THE DIRECTION OF TORQUE IN THE MOTOR.