Title: A ℌ∞-based approach for sensorless control of BLDC motors fed with four-switch inverters
Authors: Nouha Triki; Mohamed Abbes; Souad Chebbi
Addresses: Ecole Nationale Supérieure d'Ingénieurs de Tunis (ENSIT), Université de Tunis, LR11ES04 LATICE, 1008, Montfleury, Tunisia ' Ecole Nationale Supérieure d'Ingénieurs de Tunis (ENSIT), Université de Tunis, LR11ES04 LATICE, 1008, Montfleury, Tunisia ' Ecole Nationale Supérieure d'Ingénieurs de Tunis (ENSIT), Université de Tunis, LR11ES04 LATICE, 1008, Montfleury, Tunisia
Abstract: This paper presents the design and the implementation of a cost-effective sensorless control strategy for brushless DC motors fed with a four-switch inverter. In this method, a ℌ∞-controller was designed to control phase currents. A disturbance observer is used to estimate the back-EMFs of the rotor. These variables were used as the inputs of a phase locked loop to estimate the rotor position. The performances of this system were validated through simulation results. It was shown that the rotor speed remains close to the desired reference and the estimated angle is synchronised with the actual back-EMF. Compared with existing solutions, the proposed method allows the limitation of switching losses by the removal of the hysteresis controllers and the possibility to use standard driver circuits with internally set deadtime. Finally, an experimental prototype was built to verify the correctness of the presented control method.
Keywords: BLDC motor; four-Switch inverter; ℌ∞ control; disturbance observer; DOB; sensorless control.
DOI: 10.1504/IJPELEC.2023.128867
International Journal of Power Electronics, 2023 Vol.17 No.2, pp.234 - 260
Received: 02 May 2021
Accepted: 25 Aug 2021
Published online: 08 Feb 2023 *