Direct Torque Control With Linearization For Induction Motor Drives

Abstract

Direct Torque Control (DTC) is a widely adopted high-performance control strategy for induction motor drives due to its fast dynamic response and simple structure. However, conventional DTC suffers from drawbacks such as torque ripple, variable switching frequency, and sensitivity to parameter variations, which limit its performance in precision applications. This paper presents a Direct Torque Control scheme with linearization for induction motor drives aimed at improving torque and flux regulation. The proposed method introduces a linearized control model of the induction motor to simplify the nonlinear dynamics, enabling more accurate and stable control of electromagnetic torque and stator flux. By integrating linear control techniques within the DTC framework, the system achieves reduced torque ripple, improved steady-state performance, and enhanced robustness against load and parameter variations. Additionally, the switching behavior is optimized to ensure smoother inverter operation and improved efficiency. Simulation results demonstrate that the proposed linearized DTC approach significantly enhances dynamic response and reduces harmonic distortions compared to conventional DTC methods. The study confirms that linearization-based DTC is a promising solution for high-performance industrial motor drive applications requiring precision, reliability, and energy efficiency.