Electrical losses minimization of linear induction motors considering the dynamic end-effects

摘要

This paper proposes an original electrical losses minimization technique (ELMT) suitably devised for field oriented controlled (FOC) linear induction motor (LIM) drives, taking into consideration the LIM's dynamic end-effects. The proposed technique improves the very few approaches in the scientific literature dealing with ELMTs applied to LIMs in the following aspects: 1) it accounts for the LIM dynamic end-effects not only considering the variation of the LIM parameters with speed but also including the braking force caused by the end-effects in the ELMT formulation; 2) it also considers the iron losses. The proposed approach has been tested in numerical simulation and validated experimentally on a suitably developed test set-up. Results show that the application of the proposed ELMT permits a consistent losses reduction of about 22% even at low speed (0.75 m/s), as well as an increase in the overall drive efficiency from 18%, at rated constant flux, up to 24% with the ELMT.