Control apparatus

Claim 1

APPARATUS OF THE CLASS DESCRIBED COMPRISING: A MECHANICAL SUMMING DIFFERENTIAL MEANS, SAID SUMMING DIFFERENTIAL MEANS HAVING A FIRST AND SECOND INPUT AND AN OUTPUT; A FIRST AND SECOND MOTOR-GENERATOR MEANS; MEANS CONNECTING THE MOTOR OF SAID FIRST MOTOR-GENERATOR MEANS TO THE FIRST INPUT OF SAID SUMMING DIFFERENTIAL MEANS; MEANS CONNECTING THE MOTOR OF SAID SECOND MOTORGENERATOR MEANS TO THE SECOND INPUT OF SAID SUMMING DIFFERENTIAL MEANS; FIRST AMPLIFIER MEANS HAVING AN INPUT AND AN OUTPUT, SAID INPUT BEING ADAPTED TO HAVE A SIGNAL APPLIED THERETO, SAID OUTPUT HAVING A VOLTAGE THEREON WHICH IS A FUNCTION OF THE SIGNAL APPLIED TO SAID INPUT AND THE LOADING EFFECT OF A LOAD APPLIED THERETO; MEANS CONNECTING SAID OUTPUT OF SAID FIRST AMPLIFIER MEANS TO THE MOTOR-GENERATOR MEANS, SAID MOTOR EFFECTIVELY LOADING SAID OUTPUT OF SAID AMPLIFIER MEANS TO KEEP THE VOLTAGE THEREON BELOW A PREDETERMINED AMPLITUDE WHEN OPERATING BELOW A PREDETERMINED SPEED; MEANS CONNECTING THE GENERATOR OF SAID FIRST MOTOR-GENERATOR MEANS TO SAID INPUT OF SAID FIRST AMPLIFIER MEANS; A SECOND AMPLIFIER MEANS HAVING AN INPUT AND AN OUTPUT; MEANS CONNECTING SAID OUTPUT OF SAID SECOND AMPLIFIER MEANS TO THE MOTOR OF SAID SECOND MOTOR-GENERATOR MEANS; MEANS CONNECTING THE GENERATOR OF SAID SECOND MOTOR-GENERATOR MEANS TO SAID INPUT OF SAID SECOND AMPLIFIER MEANS; AND SWITCHING MEANS CONTROLLABLE TO A CONDUCTING AND A NON-CONDUCTING CONDITION, SAID SWITCHING MEANS BEING CONNECTED BETWEEN SAID OUTPUT OF SAID FIRST AMPLIFIER MEANS AND SAID INPUT OF SAID SECOND AMPLIFIER MEANS, AND SAID SWITCHING MEANS BEING NORMALLY IN THE NON-CONDUCTING CONDITION AND CONTROLLED TO THE CONDUCTING CONDITION WHEN THE VOLTAGE ON SAID OUTPUT OF SAID FIRST AMPLIFIER MEANS IS ABOVE SAID PREDETERMINED AMPLITUDE.