DEVICE OF DIRECT CONTROL OVER AC MOTOR RPM

摘要

FIELD: electrical engineering. ^ SUBSTANCE: invention relates to electrical engineering and can be used in AC drive. The proposed device incorporates a voltage frequency inverter with two independent inputs and an AC motor. The motor output shaft accommodates rpm and mechanical moment pickups. A feedback vector is formed representing a sum of the motor rpm and mechanical moment signals with the factors selected so that the feedback vector transfer function in all supply voltage and motor rpm ranges contains no oscillating components. The "Vector" is sent to the rpm large-factor control unit inverting input, while to its other input the rpm setting signal is fed. The control unit output is connected to the voltage frequency inverter first input controlling the frequency converter output signal amplitude. The signal controlling the frequency inverter output voltage is sent to the second input of the aforesaid control unit, the said frequency inverter being connected with the rpm setting unit which generates a required law of "direct" AC motor rpm variation. ^ EFFECT: direct adjustment of shaft rpm of motor that features fast monotonous processes irrespective of supply voltage frequency and rpm feedback. ^ 12 dwg