Control apparatus for three-phase motors

Claim 1

IN AN APPARATUS FOR STARTING AND RUNNING FROM A SINGLE PHASE SOURCE OF ALTERNATING ELECTRIC CURRENT SUPPLY A THREE-PHASE ALTERNATING CURRENT MOTOR HAVING FIRST, SECOND AND THIRD MOTOR TERMINALS, (1) FIRST AND SECOND CONDUCTORS FOR CONNECTING SAID FIRST AND SECOND MOTOR TERMINALS TO SAID SINGLE PHASE SUPPLY SOURCE, (2) FIRST PHASE MODIFYING MEANS CONNECTED TO SAID FIRST CONDUCTOR AND SAID THIRD MOTOR TERMINAL, (3) SECOND PHASE MODIFYING MEANS ADAPTED TO BE CONNECTED IN PARALLEL WITH RESPECT TO SAID FIRST PHASE MODIFYING MEANS UPON STARTING SAID MOTOR, (4) IMPEDANCE MEANS HAVING A FIRST TERMINAL CONNECTED TO SAID SINGLE PHASE SUPPLY SOURCE AND A SECOND TERMINAL CONNECTED TO SAID FIRST MOTOR TERMINAL BY MEANS OF SAID FIRST CONDUCTOR, (5) SWITCH MEANS HAVING START AND RUN POSITIONS WHEREBY IN SAID START POSITION SAID SECOND PHASE MODIFYING MEANS IS IN PARALLEL WITH SAID FIRST PHASE MODIFYING MEANS AND IN SAID RUN POSITION SAID SECOND PHASE MODIFYING MEANS IS DISCONNECTED, (6) AND MEANS CONNECTED TO SAID SWITCH MEANS AND BETWEEN SAID IMPEDANCE MEANS AND SAID FIRST MOTOR TERMINAL FOR POSITIONING SAID SWITCH MEANS IN SAID START POSITION DURING STARTING AND THEN PLACING SAID SWITCH MEANS IN SAID RUN POSITION DURING RUNNING ALTHOUGH THE CURRENT RATIO THROUGH SAID FIRST CONDUCTOR IS INADEQUATE IN ITSELF TO CONTROL SAID SWITCH MEANS.