Novel methodology for improving performance of sensorless speed observers in induction motors at variable load conditions. - Jesus Adolfo Carino-Corrales; Omar J. Osuna-Paez; Jesus Villalpando-Osuna; René de Jesús Romero-Troncoso; Eduardo Cabal-Yepez; Arturo Garcia-Perez; Roque Alfredo Osornio-Rios (IECON, 2012)