Three phase motor control with variable RPM and variable synchronized PWM

A motor control apparatus for initiating optocoupler-drivers to drive gates of power switchers at an inverter for magnetic flux rotation in a three phase induction motor stator, comprising:

• a circuit including:
• six optocouplers;
• and
• six precision timers, each precision timer including an output transistor;
• wherein the six precision timers are divided into
• a first set of three precision timers;
• and
• a second set of three precision timers, wherein a last output pin from the first set of three precision timers is connected to a first triggering pin of the second set of three precision timers, the first set of three precision timers and the second set of three precision timers configured to output six output pulses, and wherein the first set of three precision timers and the second set of three precision timers are connected as a talking ring mode, wherein an output pin of a last timer of the second set of three precision timers is connected to a triggering pin of a first timer of the first set of three precision timers,
• wherein each precision timer comprises a synchro pulse trigger tied between an output/input of each timer and a timing control RC circuit configured to control RPM variations, of a motor being controlled, according to a ‘V/I’ output on a collector at an odometer circuit, where ‘V/I’ is equivalent to R and f=½πRC, where R is a Resistance, C is a Capacitance, and ‘f’ is a frequency, wherein each timing control RC circuit at each respective precision timer is activated from a single pulse coming in time when a previous respective timer in the assembly from six timers turns OFF its output transistor
• wherein, the output from each precision timer is connected to an anode of an optocoupler, the output from each precision timer serving as a +5V voltage source for a single LED in each optocoupler
• where each optocoupler includes a cathode and a switching element serving as a gate driver to the power switchers in the upper stage of the inverter, wherein the power switchers at the inverter are arranged in sequence to turn on a DC current in stator coils . . . a rotor with a respective torque;
• a collector of the switching transistor is connected to said six cathodes of said six optocouplers, and
• a general purpose timer configured as a pulse width modulator connected to said switching transistors for duty cycle control and switching cathodes to ground which is serving as a −5V terminal from a respective 5V voltage source;
• wherein said switching transistors are configured to switch all said cathodes to ground serving as a switch to −5V when the LED's in the optocouplers are driven in a synchronized time from a synchro-pulse sent from a single trigger to the general purpose timer;
• and
• wherein the general purpose timer is regulated by a rheostat and is synchronized with each precision timer receiving a synchro pulse from a triggering circuit of each precision timer.