CONSISTENT ESTIMATING PARAMETERS OF THE INDUCTION MOTOR WITH ERROR OF SPEED
DOI:
https://doi.org/10.17308/sait/1995-5499/2025/4/61-74Keywords:
asynchronous motor, errors in variables, least squares method, K-parameters, consistent estimation, speed error, electric driveAbstract
Estimation of the electromagnetic parameters of an asynchronous motor is often carried out on the basis of K-parameters. The model of an asynchronous motor based on K-pa rameters is linear in coefficients, which makes it possible to simplify identification algorithms. Typically, the model with K-parameters is used provided that the rotation speed of the electric motor shaft is constant. This condition assumes the degeneracy of the covariance matrix of the signals, which creates additional difficulties in identification. The article uses an improved model of an asynchronous motor based on K-parameters, which allows identification at variable speed. T he rotation speed of an asynchronous electric motor shaft in real identification systems is al ways measured with errors. Errors can be associated both with errors in speed determination sensors and with errors that arise when estimating speed without sensors. Discretization, as well as estimation of derivative values, also introduces additional errors. The presence of errors in velocity measurements leads to biased estimates when applying ordinary least squares (LS) to estimate K-parameters. The article proposes a new method for electromagnetic estimation of the parameters of an asynchronous motor with a squirrel-cage rotor with an error in speed. It has been proven that under non-restrictive assumptions on the signal and noise, the estimates will be highly consistent. The simulation results showed that the proposed identification method based on generalized total least squares (GTLS) allows one to obtain more accurate parameter estimates than the least squares (LS) used in such methods. The results of this article can be ap plied in the development of predictive diagnostic systems and in electric drive control systems.
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