Abstract
This chapter deals with sensorless (encoderless) control of linear induction motors (LIM). Starting the analysis of the huge state of the art related to sensorless control of rotating induction motors (RIM), the very few contributions to sensorless control of LIM drives are analysed. The chapter, then, focuses on the main problems related to model-based sensorless control (open-loop integration, inverter non-linearity, parameters mismatch), describing some solutions proposed by the scientific literature. Afterwards, three recent proposals of model-based sensorless techniques, suitably developed for LIMs, are described in details: (1) the TLS EXIN MRAS (Model Reference Adaptive System) speed observer, (2) the TLS EXIN FOLO (Full Order Luenberger Observer) speed observer, (3) the CL-MRAS (Closed-Loop Model Reference Adaptive System) speed observer. Experimental tests performed on a suitably developed test set-up are shown, and some comparative performance analysis are made as well.
Published Version
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