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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS)
Zawawi, Syed Abrar S. A.
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Control & Systems Engineering Electrical & Electronics Engineering

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Enhanced torque control in high-speed DTC using modified stator flux locus Zawawi, Syed Abrar S. A.; Jidin, Auzani; Sabri, Nurul Syahada Muhamad; Tarusan, Siti Azura A.; Sutikno, Tole
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 16, No 1: March 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v16.i1.pp457-463

Abstract

This paper proposes a modification of stator flux locus in direct torque control (DTC) of induction machine, aiming to enhance torque capability during steady-state operation at high speeds. The modified flux locus maintains the simplicity of the original DTC structure and its advantages of rapid torque and flux dynamic control. However, DTC faces challenges in controlling motor torque at high-speed operations. This study addresses the limitation of the traditional circular flux locus, which limits the angular frequency of stator flux to increase further and hence causes control of torque deteriorates at high speeds. By modifying the stator flux locus from a circular to a hexagonal shape by adjusting flux hysteresis band, this can improve torque control during high-speed motor operation. This finding has potential applications in industrial and electric vehicle sectors that demand enhanced torque control for high-speed motor operations.
Optimizing low-speed DTC performance for three-phase induction motors with sector rotation strategy Sabri, Nurul Syahada Muhamad; Tarusan, Siti Azura Ahmad; Zawawi, Syed Abrar S. A.; Jidin, Auzani; Sutikno, Tole
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 16, No 1: March 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v16.i1.pp464-471

Abstract

This paper proposes a modification to the direct torque control (DTC) strategy for induction motors, focusing on improving flux performance at lower speeds. The method employs a sector rotation strategy to address stator flux droop, which occurs in conventional DTC due to the impact of stator resistance at low speed becoming more significant. This constrains the ability of the flux vector to be tangential to the voltage vector in the default sector. Consequently, an improper flux locus leads to distortion of the phase currents which disrupts precise control of torque. The proposed approach dynamically adjusts the sector angle to mitigate flux droop while maintaining the simplicity and original structure of DTC. The new sector rotation strategy is validated through simulations in MATLAB/Simulink to demonstrate the effectiveness of the proposed method in reducing stator flux droop. These findings have potential applications in the industrial sector and electric vehicles, where stable motor operation and smoother driving performance at low speeds are crucial for precise control operation.
Co-Authors Auzani Jidin Sabri, Nurul Syahada Muhamad Tarusan, Siti Azura A. Tarusan, Siti Azura Ahmad Tole Sutikno