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A RECURSIVE-LEAST-SQUARES (RLS) METHOD FOR PARAMETER ESTIMATION IN A DOUBLE-SIDED LINEAR INDUCTION MOTOR (DLIM) (Articolo in rivista)

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A RECURSIVE-LEAST-SQUARES (RLS) METHOD FOR PARAMETER ESTIMATION IN A DOUBLE-SIDED LINEAR INDUCTION MOTOR (DLIM) (Articolo in rivista) (literal)

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C. Serporta (2003)
A RECURSIVE-LEAST-SQUARES (RLS) METHOD FOR PARAMETER ESTIMATION IN A DOUBLE-SIDED LINEAR INDUCTION MOTOR (DLIM)
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The proposed method is based on the choice of the equations of the dynamical model of the rotating induction machine. It permits to have some advantages, for control purposes, in comparison with others based on the more complete, but more involved, unidimensional infinite model. Such advantages are: reduced burden of computation, adaptability to time varying parameters and, as a result, more usefulness in control applications. Its main feature is that it is based on measurable electrical and mechanical quantities and not on a priori derived analytical formulas. Numerical simulations show that the values of the estimated parameters are closer to those obtained with the open induced part test and the blocked induced part test than those obtainable using analytical simplified formulas. For this reason this method can be suitably used also for field-oriented-controlled and direct-torque-controlled drives with linear motors. (literal)

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This paper shows the application of a Recursive-Least-Squares (RLS) method for the real-time estimation of the electrical parameters of a double-sided linear induction motor (DLIM). The behaviour of the DLIM under consideration has been simulated by using a dynamical unidimensional infinite model. However, in order to estimate the electrical parameters of the DLIM, the usual dynamical model of the rotating induction machine has been used, as it is simpler and consequently less cumbersome from the point of view of the computational burden. The results obtained by using the RLS-based parameter estimation method have been compared to those retrieved from both the usual open-induced and blocked-induced tests and the analytical simplified model (mathematical model where the Fourier space expansion of the electromagnetic quantities is limited to the fundamental harmonic). The numerical results show that the electrical parameters estimated with the RLS method are very close to those retrieved from the open-induced and blocked-induced tests whilst they are somewhat different from those obtained from the analytical simplified model. Furthermore it is shown that the proposed method is able to track any possible time variation of the parameters, and it can be therefore successfully used for control purposes for both vector and direct-torque controlled induction linear motor drive. (literal)

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