METHOD FOR CONTROLLING AC CONVERTER-FED MOTOR AND A SERVO SYSTEM FOR ITS IMPLEMENTATION Russian patent published in 2018 - IPC H02P6/12 H02P6/16 H02P6/17 G05B11/01 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used in servo control and regulation systems to generate control signals in a system with AC converter-fed motor. In the method for controlling an AC converter-fed motor and a servo system, when converting the angle of turn of the synchronous motor shaft into a three-phase electrical signal of the rotor position sensor, the amplitude of which is proportional to the control signal, and the formation of a three-phase supply voltage of the motor, the average value of which varies according to the sine law, the three-phase supply voltage is formed from the difference of the signal of the three-phase rotor position sensor of the synchronous motor and the signal of the three-phase current sensor of the synchronous motor, the relay control signal being generated from the difference in the speed reference signal, the speed feedback signal and the acceleration feedback signal. Servo system with the AC converter-fed motor for carrying out the method comprises, in series, a first adder, the summing input of which is the input of the speed control of the AC converter-fed motor, a modulator, a three-phase synchronous motor rotor position sensor, a three-phase demodulator, a first summing input of a three-phase adder, a three-phase relay, a three-phase converter, a three-phase synchronous motor current sensor and a three-phase synchronous motor, the rotor of which is mechanically connected to the shaft of the three-phase rotor position sensor of the synchronous motor and to the shaft of the synchronous motor speed sensor, the second countdown input of the three-phase adder is connected to the output of a three-phase synchronous motor current sensor, the output of the synchronous motor speed sensor is connected to the countdown input of the first adder. In the servo system, an observer is additionally introduced, calculating the derivative of the input signal, the second adder and the relay, the output of which is connected to the modulator input, the relay input is connected to the second adder output, the observer input is connected to the synchronous motor speed sensor output, the observer output is connected to the countdown input of the second adder.

EFFECT: technical result is the obtaining of the optimum rate of turn of the AC converter-fed motor, that would be invariant (independent of the changing motor torque), by analytically constructing the optimal speed controller for the rate of turn of the AC converter-fed motor and the current controller of the AC converter-fed motor subordinate to it.

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