RT info:eu-repo/semantics/article
T1 Sliding mode observer with exponential reaching law for speed estimation of a six-phase induction machine
A1 Delorme Diarte, Silvia Larizza
A1 Ayala Silva, Magno Elías
A1 González Barrios, Osvaldo Julián
A1 Rodas Benítez, Jorge Esteban
A1 Fleitas Bordón, Ariel
A1 Gregor Recalde, Raúl Igmar
A1 de la Casa Hernández, Jesús
AB High-performance sensorless operation in multiphase electric drives requires speed estimation techniques capable of providing fast dynamic response, reduced oscillatory behavior, and low implementation complexity. In this context, a sliding-mode observer (SMO) based on an exponential reaching law (ERL) is proposed for rotor speed estimation in asymmetrical six-phase induction machines operating under indirect rotor field-oriented control. Unlike conventional SMO implementations, the proposed approach avoids auxiliary low-pass filtering (LPF) stages by employing an ERL-based adaptive gain mechanism, thereby preventing the phase delay and bandwidth reduction commonly associated with LPF-based observers. As a result, the proposed observer preserves fast transient dynamics, attenuates chattering near the sliding surface, and improves the smoothness of the estimated signals. The proposed technique is particularly suitable for multiphase drive applications, where sensorless operation reduces hardware complexity and improves system reliability by eliminating mechanical speed sensors and associated wiring. A Lyapunov-based stability analysis is presented to demonstrate the convergence properties of the observer and discuss the influence of the ERL parameters on the estimation dynamics. Simulation and experimental results obtained on a real-time test bench validate the digital implementation of the proposed SMO + ERL, demonstrating improved transient tracking, smoother estimated signals, stable low-speed operation, satisfactory speed reversal performance, and effective operation under loaded conditions.
PB Multidisciplinary Digital Publishing Institute
YR 2026
FD 2026-07-16
LK http://hdl.handle.net/20.500.14066/4817
UL http://hdl.handle.net/20.500.14066/4817
LA eng
NO Delorme, L., Ayala, M., Gonzalez, O., Rodas, J., Fleitas, A., Gregor, R., & Hernandez, J. C. (2026). Sliding Mode Observer with Exponential Reaching Law for Speed Estimation of a Six-Phase Induction Machine. Sensors, 26(14), 4513. https://doi.org/10.3390/s26144513
NO Correspondence: ldelorme@ing.una.py (L.D.); jcasa@ujaen.es (J.C.H.).
NO This article belongs to the Special Issue Sensors for Fault Diagnosis of Electric Machines.
NO Consejo Nacional de Ciencia y Tecnología
DS MINDS@UW
RD 03-sep-2026