METHOD OF OBTAINING SIGNAL FOR ESTIMATING ROTOR SPEED AND SIGNAL FOR ESTIMATING MOMENT OF RESISTANCE ON SHAFT OF SYNCHRONOUS ELECTRIC MOTOR WITH PERMANENT MAGNETS Russian patent published in 2025 - IPC H02P21/18 H02P25/22 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, namely to electrical machines and measuring equipment, and can be used for digital control of synchronous electric motor with permanent magnets. Technical result is achieved due to the method of obtaining a signal for estimating the rotor rotation frequency and a signal for estimating the moment of resistance on the shaft of a synchronous electric motor with permanent magnets, which includes measuring instantaneous values of phase currents I_A(t), I_B(t), I_C(t) and phase voltages U_A(t), U_B(t), U_C(t) at a given sampling period T_s, which are converted from a three-phase coordinate system into a rectangular coordinate dq-system rotating synchronously with the rotor. Signals of currents I_d(k), I_q(k) and voltages U_d(k), U_q(k) are time delayed by one sampling period. Obtained values of currents I_d(k), I_q(k) and voltages U_d(k), U_q(k) and delayed values of currents I_d(k-1), I_q(k-1) and voltages U_d(k-1), U_q(k-1) are used to determine prediction values of current estimation at current sampling step. Obtained values of the prediction of the current estimate are corrected and the time delay of the values of the currents Î_d(k), Î_q(k) is performed by one sampling period to determine the value of the current Î_d(k-1), Î_q(k-1) estimate at the previous sampling step. Further, the prediction value of the moment of resistance on the shaft of the synchronous electric motor with permanent magnets is determined at the current sampling step and the value of correction of the estimate of the moment of resistance on the shaft is determined synchronous electric motor with permanent magnets at the current sampling step. Time delay of correction of the moment of resistance on the shaft of the synchronous electric motor with permanent magnets is performed for one sampling period to obtain a signal for correction of the moment of resistance on the shaft at the previous sampling step. Estimation of the moment of resistance on the shaft M̂_C(k) is determined at the current sampling step and the obtained estimate of the moment of resistance is delayed by one sampling period M̂_C(k-1). Then the prediction value of the rotor rotation frequency estimate is determined at the current sampling step. Obtained value is corrected to determine the rotor rotation frequency . Time delay of rotor rotation frequency estimation is performed for one sampling period to obtain rotor rotation frequency estimation signal at the previous sampling step.

EFFECT: invention makes it possible to realize control of synchronous electric motor with permanent magnets in digital form, which is characterized by lower resource consumption of calculations and allows to expand functional capabilities of electric drive.

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