Stepless speed control for induction motor

Claim 1

A CONTROL SYSTEM THAT CAN BE CONNECTED TO A SOURCE OF ALTERNATING CURRENT AND TO AN INDUCTION MOTOR TO PROVIDE STEPLESS CONTROL OF THE SPEED OF SAID MOTOR AND THAT COMPRISES: (A) TERMINALS THAT ARE CONNECTABLE TO A SOURCE OF ALTERNATING CURRENT, (B) A VARIABLE IMPEDANCE ELEMENT THAT CAN HAVE THE IMPEDANCE THEREOF VARIED TO CONTROL THE EFFECTIVE POWER SUPPLIED TO SAID MOTOR BY SAID SOURCE OF ALTERNATING CURRENT, AND CAN THEREBY DETERMINE THE TORQUE PROVIDED BY SAID MOTOR AND THE SPEED OF THE ROTOR OF THE MOTOR, (C) A BRIDGE RECTIFIER THAT HAS ONE INPUT TERMINAL THEREOF CONNECTED TO ONE OF SAID TERMINALS VIA SAID MOTOR AND THAT HAS THE OTHER INPUT TERMINAL THEREOF CONNECTED TO THE OTHER OF SAID TERMINALS, (D) SAID BRIDGE RECTIFIER HAVING THE OUTPUT TERMINALS THEREOF CONNECTED TO SAID VARIABLE IMPEDANCE ELEMENT, (E) A COMBINATION STARTING CIRCUIT AND RUNNING CIRCUIT WHICH HAS A STARTING PORTION AND A RUNNING PORTION, (F) SAID STARTING PORTION INCLUDING A CAPACITOR, (G) SAID CAPACITOR INITIALLY BEING SUBSTANTIALLY FREE OF CHARGE SO THE CURRENT FLOWING THERETHROUGH DURING A GIVEN HALF CYCLE OF THE ALTERNATING CURRENT CAN PROMPTLY RENDER SAID VARIABLE IMPEDANCE ELEMENT CONDUCTIVE, WHEREBY SAID VARIABLE IMPEDANCE ELEMENT CAN PERMIT LARGE VOLTAGES TO BE SUPPLIED TO SAID MOTOR BY SAID SOURCE OF ALTERNATING CURRENT TO ENABLE SAID MOTOR TO PROVIDE LARGE VALUE OF TORQUE, (H) SAID CAPACITOR CONTINUING, DURING EACH HALF CYCLE OF THE ALTERNATING CURRENT UNTIL THE ROTOR OF THE MOTOR GETS UP TO SPEED, TO PERMIT THE CURRENT FLOWING THERETHROUGH TO QUICKLY RENDER SAID VARIABLE IMPEDANCE ELEMENT CONDUCTIVE, WHEREBY SAID VARIABLE IMPEDANCE ELEMENT CAN PERMIT LARGE VOLTAGES TO BE SUPPLIED TO SAID MOTOR BY SAID SOURCE OF ALTERNATING CURRENT TO ENABLE SAID MOTOR TO PROVIDE LARGE VALUES OF TORQUE, (I) SAID CAPACITOR RESPONDING TO THE ALTERNATING CURRENT SUPPLIED TO SAID CONTROL SYSTEM TO ACCUMULATE A CHARGE, (J) SAID CAPACITOR RESPONDING TO A PREDETERMINED CHARGE THEREIN TO LIMIT THE VALUE OF THE CURRENT FLOWING THERETHROUGH DURING SUCCEEDING HALF CYCLES OF THE ALTERNATING CURRENT TO A LEVEL THAT IS TOO SMALL TO RENDER SAID VARIABLE IMPEDANCE ELEMENT CONDUCTIVE, (K) SAID RUNNING PORTION INCLUDING A SECOND CAPACITOR AND A BREAK-DOWN ELEMENT, (L) SAID SECOND CAPACITOR PASSING VERY LITTLE CURRENT UNTIL THE FIRST SAID CAPACITOR ACCUMULATES SAID PREDETERMINED CHARGE, AND THEREAFTER RESPONDING TO SUBSEQUENT HALF CYCLES OF THE ALTERNATING CURRENT TO ACCUMULATE CHARGES THEREIN THAT CAUSE SAID BREAKDOWN ELEMENT TO BREAK DOWN, (M) SAID BREAK-DOWN ELEMENT ISOLATING THE REST OF SAID RUNNING PORTION FROM SAID VARIABLE IMPEDANCE ELEMENT BUT, AFTER IT BREAKS DOWN, PERMITTING SAID RUNNING PORTION TO RENDER SAID VARIABLE IMPEDANCE ELEMENT CONDUCTIVE, WHEREBY SAID VARIABLE IMPEDANCE ELEMENT CAN PERMIT LESSER VOLTAGES TO BE SUPPLIED TO SAID MOTOR BY SAID SOURCE OF ALTERNATING CURRENT SO SAID ROTOR OF SAID MOTOR CAN ROTATE AT THE DESIRED SPEED.