Single phase induction motors and starting arrangement therefor

Claim 1

IN A SINGLE PHASE INDUCTION MOTOR HAVING A STATOR MEMBER, A MAIN PRIMARY WINDING DISPOSED IN SAID STATOR MEMBER AND INCLUDING END TURNS EXTENDING THEREFROM, A STARTING WINDING PHYSICALLY DISPLACED FROM SAID MAIN PRIMARY WINDING, A PAIR OF CONTROLLED RECTIFIERS CONNECTED IN INVERSE PARALLEL RELATION, EACH OF SAID CONTROLLED RECTIFIERS HAVING A GATE, A CATHODE AND ANODE, CIRCUIT MEANS CONNECTING SAID CONTROLLED RECIFIERS IN SERIES CIRCUIT WITH SAID STARTING WINDING AND INCLUDING ELECTRICAL LEADS FOR CONNECTING SAID CONTROLLED RECTIFIERS AND STARTING WINDING IN CIRCUIT WITH A POWER SOURCE, A SECONDARY WINDING CONNECTED IN CIRCUIT WITH THE GATE AND CATHODE EACH OF SAID CONTROLLED RECTIFIERS, AND A SATURABLE MAGNETIC CORE, SAID SECONDARY WINDINGS AND AT LEAST SOME OF THE END TURNS OF SAID MAIN PRIMARY WINDING BEING INDUCTIVELY COUPLED ON SAID SATURABLE MAGNETIC CORE BY THE LEAKAGE FLUX OF SAID END TURNS, SAID LEAKAGE FLUX IN SAID END TURNS BEING SUFFICIENT DURING THE STARTING CONDITION TO SATURATE SAID MAGNETIC CORE AND THEREBY CAUSE FIRING PULSES TO BE INDUCED IN SAID SECONDARY WINDINGS TO FIRE ONE OF SAID CONTROLLED RECTIFIERS DURING EACH ALTERNATION OF THE POWER SUPPLY, AND SAID LEAKAGE FLUX BEING INSUFFICIENT TO SATURATE SAID SATURABLE MAGNETIC CORE WHEN THE RUNNING CONDITION OF THE MOTOR IS REACHED AND SAID CONTROLLED RECTIFIERS THEREBY BEING IN A BLOCKING STATE AND CUTTING OFF THE POWER SUPPLY TO SAID STARTING WINDING.