Rectifier-inverter motor power supply

Claim 1

A POWER SUPPLY FOR A THREE-PHASE MOTOR COMPRISING; A THREE-PHASE SELF-COMMUTATING RECTIFIER BRIDGE MEANS HAVING THREE CONTROLLED RECTIFIERS AND THREE DIODES WITH THE INPUT OF SAID RECTIFIER MEANS CONNECTED TO RECEIVE A THREE-PHASE CURRENT, AN INVERTER MEANS CONNECTED TO THE OUTPUT OF SAID RECTIFIER MEANS, SAID INVERTER MEANS HAVING THREE PARALLEL CIRCUITS EACH INCLUDING A PAIR OF SERIES CONNECTED CONTROLLED RECTIFIERS PROVIDING A FREQUENCY CONTROLLED THREE-PHASE OUTPUT CURRENT, AND A CONTROL MEANS OPERATIVELY CONNECTED TO BOTH SAID RECTIFIER BRIDGE MEANS AND SAID INVERTER MEANS PROVIDING FIRST CONTROL SIGNALS TO SAID CONTROLLED RECTIFIERS OF SAID RECTIFIER BRIDGE MEANS, SAID FIRST CONTROL SIGNALS FROM SAID CONTROL MEANS TO SAID CONTROLLED RECTIFIERS OF SAID RECTIFIER BRIDGE MEANS RENDERING SAID RECTIFIER BRIDGE MEANS OPERATIVE FOLLOWING AN INOPERATIVE TIME INTERVAL WHEREIN CURRENT IS REMOVED FROM THE RECTIFIER BRIDGE MEANS OUTPUT, SAID CONTROL MEANS PROVIDING SECOND CONTROL SIGNALS FOLLOWING EACH TIME INTERVAL WHEREIN SAID RECTIFIER BRIDGE MEANS IS INOPERATIVE, SAID SECOND CONTROL SIGNALS BEING PERIODICALLY APPLIED TO DIFFERENT PRESELECTED PAIRS OF CONTROLLED RECTIFIERS IN SAID INVERTER MEANS FOR SUPPLYING PERIODICALLY INTERRUPTED PULSES OF THREE-PHASE ALTERNATING CURRENT FROM SAID INVERTER MEANS.