Pulse fed d.c. motor speed system

Claim 1

A SPEED CONTROL SYSTEM FOR APPLYING VARIABLE DURATION POWER PULSES TO A MOTOR COMPRISING: A CONSTANT FREQUENCY OSCILLATOR, A FREQUENCY DIVIDER CIRCUIT ENERGIZED BY SAID OSCILLATOR TO PRODUCE START PULSES AT A LOWER FREQUENCY, A FEEDBACK PULSE PRODUCER GENERATING PULSES AT A RATE CORRESPONDING TO MOTOR SPEED, MEANS FOR ENERGIZING SAID MOTOR WITH POWER PULSES HAVING A TIME DURATION PROPORTIONAL TO THE PHASE DIFFERENCE BETWEEN SAID START PULSES AND FEEDBACK PULSES AND FOR DISCONTINUING THE POWER TO THE MOTOR FOR THE REMAINING TIME DURATION, A MEMORY CIRCUIT RESPONSIVE TO THE DURATION OF THE POWER PULSES EXCEEDING THE PRESET PERIOD OF SAID FREQUENCY DIVIDER CIRCUIT FOR DELAYING THE FOLLOWING START PULSE PRODUCED BY SAID FREQUENCY DIVIDED CIRCUIT UNTIL JUST AFTER THE NEXT SUCCEEDING FEEDBACK PULSE IN PRODUCED, AND AN OVERSPEED CONTROL FEEDBACK CIRCUIT FOR RESETTING SAID FREQUENCY DIVIDER TO DISABLE A SUCCEEDING START PULSE IN THE EVENT THAT A FEEDBACK PULSE IS PRODUCED AT A TIME WHEN NO POWER PULSE IS BEING APPLIED TO SAID MOTOR.