Stepper motor control circuit

Claim 1

A CONTROL SYSTEM FOR A DIRECT CURRENT MOTOR HAVING A DRIVEN ROTOR AND A PLURALITY OF ROTOR DRIVING MAGNETIC FIELD ESTABLISHING INDUCTANCE COILS, COMPRISING IN COMBINATION: A DIRECT CURRENT VOLTAGE SOURCE HAVING A POSITIVE AND A NEGATIVE TERMINAL FOR IMPOSING A DIRECT CURRENT VOLTAGE ACROSS EACH OF THE COILS OF SAID MOTOR; A PLURALITY OF SILICON CONTROLLED RECTIFIERS SO DISPOSED AS TO PROVIDE A SINGLE SILICON CONTROLLED RECTIFIER BETWEEN EACH OF SAID COILS AND THE NEGATIVE TERMINAL OF SAID SOURCE; A POSITIVE VOLTAGE SIGNAL PULSE SOURCE; MEANS FOR CONNECTING THE POSITIVE VOLTAGE SIGNAL PULSE SOURCE WITH THE GATE OF EACH OF SAID SILICON CONTROLLED RECTIFIERS; A PLURALITY OF GATE CAPACITORS ARRANGED WITHIN THE SIGNAL PULSE SOURCE CONNECTING MEANS SO AS TO PROVIDE A SINGLE GATE CAPACITOR DISPOSED BETWEEN THE GATE OF EACH OF THE SILICON CONTROLLED RECTIFIERS AND THE SIGNAL PULSE SOURCE; AND A PLURALITY OF CURRENT INTERRUPTING CAPACITORS SINGULARLY CONNECTED BETWEEN THE COILS, AT THE NEGATIVE TERMINAL SIDES THEREOF, SO AS TO PROVIDE A SINGLE SILICON CONTROLLED RECTIFIER INTERRUPTING CAPACITOR BETWEEN EACH OF THE COILS, WHEREBY WHEN A GIVEN FIRST SILICON CONTROLLED RECTIFIER OF SAID PLURALITY OF SILICON CONTROLLED RECTIFIERS IS CONDUCTING A CURRENT, AND A FIRST COIL OF SAID PLURALITY OF COILS IS ENERGIZED, A POSITIVE PULSE APPLIED TO THE PULSE SOURCE CONNECTING MEANS SERVES TO ACTIVATE THE SECOND SILICON CONTROLLED RECTIFIER TO THUS SEQUENTIALLY ENERGIZE A SECOND COIL ADJACENT SAID FIRST COIL AND EFFECT AN INTERRUPTION OF CURRENT THROUGH SAID FIRST SILICON CONTROLLED RECTIFIER TO IMPART A ROTATION TO SAID ROTOR OF SAID MOTOR THROUGH A THUS SEQUENTIALLY ESTABLISHED ROTATING MAGNETIC FIELD.