Shaft synchronizing and phasing motor control system

Claim 1

MEANS FOR AUTOMATICALLY DETECTING AND CONTROLLING SHAFT PHASE AMBIGUITIES CAUSED BY GEAR TRAINS BETWEEN A REFERENCE POLARIZED SYNCHRONOUS MOTOR AND A SHAFT DRIVEN THEREBY AND A POLARIZED SYNCHRONOUS MOTOR SLAVED TO SAID REFERENCE MOTOR AND A SHAFT DRIVEN BY SAID SLAVE MOTOR, THE SAID SHAFTS BEING REQUIRED TO ROTATE IN SYNCHRONISM, COMPRISING: A CIRCUIT INCLUDING AN ALTERNATING CURRENT POWER SOURCE FOR EACH OF SAID MOTORS, THE REFERENCE MOTOR BEING CONNECTED DIRECTLY TO SAID ALTERNATING CURRENT POWER SOURCE; A REVERSING SWITCH FOR REVERSING THE CONNECTIONS TO THE ALTERNATING CURRENT POWER SUPPLY TO SAID SLAVE MOTOR; ELECTRICALLY OPERATED MEANS CONTROLLING SAID REVERSING SWITCH; AND MEANS SENSING LACK OF IN-PHASE RELATION OF THE DRIVEN AND SLAVE SHAFTS AT EACH REVOLUTION OPERATING SAID REVERSING SWITCH MEANS TO REVERSE THE POLARITY OF THE SUPPLY POWER TO THE SLAVE MOTOR TO CAUSE CHANGE OF PHASE OF THE STATOR MAGNETIC FIELD WITH RESPECT TO THE ROTOR FIELD DURING EACH REVOLUTION AND CONTINUING SAID REVERSALS OF THE STATOR FIELD UNTIL SYNCHRONISM IS REESTABLISHED.