Flux compensated direct torque control of induction motor drives for low speed operation

• Published in: IEEE transactions on power electronics Vol. 19; no. 6; pp. 1608 - 1613
• Main Authors: SHYU, Kuo-Kai, SHANG, Li-Jen, CHEN, Hwang-Zhi, JWO, Ko-Wen
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.11.2004; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Commutation; Construction; DC motors; Digital electronics; Direct torque control (DTC); Electric potential; Electric power; Electrical engineering. Electrical power engineering; Electrical machines; Exact sciences and technology; Flux; induction motor; Induction motor drives; Induction motors; Linear feedback control systems; Low speed; Motor drives; Motors; Power electronics, power supplies; Regulation and control; Rotors; Stators; Torque; Torque control; Voltage; Waveform; Direct digital control; Stator; induction motor; Low speed; Voltage fall; Motor torque; Power electronics; Direct torque control (DTC); Experimental study; Motor control; Induction motor drives; Experimental result; Algorithm performance; Torque control; Control method; Speed control; Digital signal processor; Fixed point
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2004.836618

Speed control of direct torque controlled (DTC) induction motor drives depends on effectively establishing the stator flux. However, it becomes difficult when the motor operates in the low speed region, because the voltage drop on the stator resistance is comparable with the input stator voltage. Therefore, this study proposes an easy but effective way to compensate the voltage drop on the stator resistance so that the stator flux can be constructed without identifying the stator resistance as done by most authors. As a result, motor torque is constructed due to the effective stator flux compensation, which makes the DTC applicable to induction motor drives in the low speed region. Moreover, a fixed-point digital signal processor (DSP)-based hardware experimental system is built to demonstrate the effectiveness of the proposed control method.