Closed-Loop MRAS Speed Observer for Linear Induction Motor Drives
This paper presents a closed-loop model reference adaptive system (CL-MRAS) speed observer developed for linear induction motor (LIM) drives. Starting from the structure of the CL-MRAS speed observer developed within the literature for rotating induction motors, a corresponding speed observer for LIMs has been developed here. It's primarily based on the LIM dynamic model taking into thought its dynamic end effects. In explicit, the subsequent aspects are original: one) It employs the voltage and current models of the LIM considering its dynamic end effects, 2) it proposes a web thrust model including the braking force caused by the dynamic finish effects; 3) it models the friction load of the LIM drive experimentally obtained with off-line tests. The proposed sensorless technique has been tested on a purposely developed experimental set-up. Results show that the CL-MRAS observer permits the drive to control down to the speed of zero.01 m/s, i.e., about zero.15percent of the rated speed, that is concerning twenty times under the minimum working speed achieved with alternative observers implemented on the same LIM drive, like the whole least squares (TLS) MRAS observer, the TLS EXIN full-order Luenberger observer, the extended Kalman filter, and, finally, the TLS EXIN Kalman filter.
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