METHOD OF DETERMINING LOAD TORQUE OF ASYNCHRONOUS ELECTRIC MOTOR Russian patent published in 2025 - IPC G01L3/22 G01R31/34 H02P21/14 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used when taking into account the load torque of an asynchronous electric motor. Instantaneous values of currents and voltages of the asynchronous motor stator are measured, three-phase values of currents and voltages are converted into two-phase components of currents and voltages. Estimates of stator current components are determined at each time interval, and estimates of rotor flux linkage components are calculated. Residual function and its increment are determined from the estimated values of the stator current and the rotor flux linkage. Based on the values of the residual function and its increment, the residual function and the increment of the residual function are determined to be five linguistic variables using a fuzzy logic apparatus. Using the Mamdani fuzzy implication technique, logical variables are interpreted according to a set of rules. At the defuzzification stage, amplification factors of the proportional, integral and differential components are determined by the centre of gravity method. Using the obtained coefficients, the residual function and the increment of the residual function, the angular rotation speed of the rotor of the asynchronous motor is determined. Obtained value of the angular velocity is used to determine the estimates of the stator current, the rotor flux linkage and the residual function at the next step. Values of electromagnetic moment and angular speed of rotor rotation are used to determine value of load torque of induction motor.

EFFECT: higher accuracy of load torque measurement.

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