Exploration And Research Of The Direct Torque Control System Based On DSP

The direct torque control theory is a kind of new control method after vector control theory in AC control field. It calculates and controls the torque and the flux of AC electromotor in stator coordinate using the voltage space vector. Adopting the stator magnetism field direction method, it recurs to discrete Pang-pang control producing Pulse Width Modulation signal and controls the switch state of the transductor when better quality steady-state performance is produced. Because complicated vector transform and the math model in AC drive is deduced, the method has the performance of quick reaction and design.The operation of algorithm about the direct torque control is more complex. The general Single-chip Microcomputer as core control ware has not been able to fit controlling timely request of system. Therefore we adopt to Digital Signal Processor that is used for special purpose and made by Company TI. It is integrated by some peripheral circuit of motor control, for example A/D invertion circuit, QEP, signal of Pulse Width Modulation, DB produce circuit and so on. So the circuit design is simplified and the period of design is shorten.In this paper, we adopt directly to assemble language to write program that compose system software. The assemble language that is used for DSP is single period command, therefore the efficiency of command is increased and control system gets very good effect.The hardware based on Intelligent Power Modules and DSP and the software program can realize the direct torque control of asynchronous AC drive. The system has good dynamic and static state by the method the direct torque control. Its respond is also quick. It is an ideal method of AC drive control.