Totally adaptive observer for speed sensorless induction motor drives: Simply a cost of extra energy consumption

摘要

This paper addresses the method for total parameters identification in speed sensorless induction motor drives. By total parameters identification, it means that all the inverse-Γ circuit parameters are poorly known and need to be identified. Based on the parameter sensitivity, an alternating-current (AC) signal of medium frequency (25 Hz) is superimposed onto the stator magnetizing current, so that the norms of columns of the regressive matrix of the voltage model are boosted, which rejects the disturbance of the unknown flux error and enforces convergence of the stator-side parameters. With stator-side parameters estimated, the remaining parameters are identified under the condition of persistent excitation. Effective simulation results are included.