METHOD OF OBTAINING SIGNAL FOR ESTIMATING ROTOR SPEED AND SIGNAL FOR ESTIMATING MOMENT OF RESISTANCE ON ASYNCHRONOUS MOTOR SHAFT Russian patent published in 2024 - IPC H02P23/14 H02P27/04 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, namely to electrical machines and measuring equipment, and can be used for digital control of an asynchronous motor. Method of obtaining rotor speed estimation signal and asynchronous motor shaft moment of resistance estimation signal consists in the fact that simultaneous measurement of instantaneous values of currents and voltages on three phases of stator during start-up and operation of asynchronous motor, simultaneously converting the measured instantaneous values of currents and voltages in a three-phase coordinate system into values of currents and voltages in a rectangular stationary coordinate system at a given sampling period, their time delay is performed by one sampling period. Converted and delayed values of currents and voltages are used to determine the values of the prediction of the current estimate in a rectangular stationary coordinate system at the current sampling step; the obtained values of the forecast of the current estimate are corrected. Then performing the current estimation values time delay by one sampling period, obtaining the currents estimation values in the rectangular stationary coordinate system at the previous sampling step, and determining prediction values of rotor flux linkage estimates in rectangular stationary coordinate system at current sampling step. Correcting the rotor flux linkage estimates obtained values and performing the rotor flux linkage estimates values time delay by one sampling period, obtaining values of estimates of rotor flux linkage in rectangular stationary coordinate system at previous step of sampling. Further, the value of predicting the estimate of the moment of resistance on the shaft of the asynchronous motor is determined in a rectangular stationary system of coordinates at the current sampling step and determining the correction value of the resistance moment on the asynchronous motor shaft in the rectangular stationary coordinate system at the current sampling step, time delay is performed for one sampling period, obtaining a signal for correction of estimation of the moment of resistance on the shaft of the asynchronous motor in a rectangular stationary system of coordinates at the previous sampling step. After that, determining the value of estimating the moment of resistance on the shaft of the asynchronous motor in a rectangular stationary coordinate system at the current sampling step and determining the prediction value of the rotor rotation frequency in the rectangular stationary coordinate system at the current sampling step. Correcting the rotor rotation frequency estimate prediction value and performing the rotor rotation frequency estimation time delay by one sampling period, obtaining a rotor speed estimation signal in a rectangular stationary coordinate system at the previous sampling step.

EFFECT: wider range of means for obtaining a signal for estimating rotor rotation frequency and a signal for estimating the moment of resistance on the asynchronous motor shaft.

1 cl, 4 dwg, 1 tbl