Corresponding author: ziane1419@yahoo.fr Department of Electrical Engineering, Bejaia University, Bejaia Algeria Copyright © JES 2013 on-line : journal/esrgroups.org/jes ZIANE Djamel AZIB Ahmed Dr TAIB Nabil Pr REKIOUA Toufik J. Electrical Systems 9-1 (2013): 114-124 Regular paper Study and Design of the direct torque control of Double star induction motor JES Journal of Electrical Systems This study focuses on the design and construction of a power to direct torque control of double star induction machine. After modeling the induction machine, the voltage source inverter and the DTC technique are defined and described. For a double star induction machine the voltage source inverter adapted is a six phase topology. This latter is composed of 12 IGBT connected in antiparallel with 12 fast diodes. The control technique is implemented on the DSP board based on TMS320LF2407A which allows a great flexibility in the control, quite large execution speed and real time program flow. The system was tested experimentally. The obtained results show the effectiveness of the technique and the system. Keywords: Double star induction motor, direct torque control, DSP TMS320LF2407A, switching table. 1. Introduction Since the appearance of induction and synchronous AC machines, the three-phase structure has quickly established itself in the industrial world. The induction machine is currently the most used in industrial drive systems because of its numerous advantages: simplicity of its control, robustness and low cost [1] [2]. In the industrial applications where high reliability is required, multi-phase induction machines instead of traditional three-phase machines are used. In the multi- phase drive systems, the electric machine has more than three phases in the stator and the same number of inverter legs is in the inverter side. The advantages of multi- phase drive systems are: total rating of system is multiplied, the torque pulsations will be smoothed, the rotor harmonic losses as well as the harmonics content of the DC link current will be reduced and the loss of one or more phases does not prevent the machine working, so improving the system reliability. The most common multiphase machine drive structure is the double star induction motor (DSIM), which has six windings in the stator.[3],[4]. The development of power semiconductors has created fast switches used in power converters. They offer great flexibility of use and simplify drive systems of induction machines. The digitization of the control of these converters, with the emergence of processors, has made these structures faster and more reliable, which helped to spread this technology in the industry where they undergo great stress [5], [6], [7], So multiphase machines are increasingly sought as they have the advantages of the distribution of power and reliable operation, their advantages appear at a high power systems especially [8], [9]. Direct torque control (DTC) of induction motors, which has been developed in the recent decade, is powerful control method for motor drives [10],[11], [12]. Featuring direct control of the stator flux and torque insread of the conventional current control technique, it provides a systematic solution to improve operating characteristics of not only the motor but also the voltage source inverter (VSI).