An Adaptive Identification of Rotor Time Constant for Speed-Sensorless Induction Motor Drives: A Case Study for Six-Phase Induction Machine

Accurate rotor time constant ( $T_{r}$ ) value is necessary to ensure an acceptable performance of the indirect field-oriented control (IFOC) strategy, where a detuned affects flux orientation and, in turn, results poor dynamic and steady-state response torque. The problems associated with will be exacerbated sensorless drives when model-based speed estimation algorithm employed. This article investigates problem simultaneous identification for IFOC six-phase induction motor (6PIM) drives. First, adaptive observer proposed online detection low-frequency sinusoidal signal, which intentionally injected into command. Then, novel model reference system (MRAS)-based estimator using detected signal. Lyapunov stability theorem used asymptotic system. method based on machine (IM) primary subspace, i.e., notation="LaTeX">$\alpha $ – notation="LaTeX">$\beta subspace. Hence, it usable other multiphase IM (three phases higher). Nevertheless, 6PIM adopted here as case study. simulation experimental clarify effectiveness parallel