Inductipn Motor Direct Torque Control System Research Based On TMS320LF2407A

Induction motor has been used everywhere in industry. The improving of the automatic technology in industry brings the stricter requirement to the motor control system. The highest precision, shortest response time and simplest computing are the eternal destination of motor control system. Direct Torque Control (DTC) was advanced and developed based on these objects by western country -Germany. Nowadays, it has become the most important control theory in induction motor control system just because of its characteristics such as simple computing, low reliability to motor parameter and good dynamic and statistic characteristic.The paper introduces the theory of DTC. With induction motor's mathematical model, the paper obtains the space voltage vector through the analysis to the inverter switch-status and gets the basic structure of DTC and introduces each unit of DTC. According to the magentic control theory and torque control theory, the paper analysis the choice of the space vector, with Band-Band regulator of flux and the torque three-point regulator,.the article simulates the DTC system with Matlab/Simulink, adopting one kind of low pass filter, which improves the fault of the flux ripple in low speed in tradional DTC. Besides, the paper also elementary introduces the DTC for speed sensorless.Based on the simulation of the induction motor, the TMS320LF2407A chip and IPM model are applied in the design of the hardware. DSP and IPM have realized the combination of the advanced theory and the advanced device. With CCS, using the thought of the dispatcher, mixing C language and assembler language to programe, the paper have realized the DTC.The paper completes the modeling and simulation on the research of the theary of DTC the simulation indicates that the improved low pass filter can reduce the flux ripple, the TMS320LF2407A is used to control induction motor in the article and the thought of the dispatcher is adopted in the design of soft, the result of experiment indicates that it is feasible to use this method in the control domain of inducton motor.