Research And Realization Of Direct Torque Control System Of The Asynchronous Motor Based On TMS320F2808

Direct Torque Control (DTC), which developed after vector control is another novel and high-performance control strategy for the AC variable-frequency adjusting-speed drives. It is very popular for its merits, such as structure simplicity, robustness, excellent static and dynamic performance, and easy implementation etc. At present, an application to product-oriented of direct torque control technology of the asynchronous motor based on DSP is strong demand in the AC inverter market.Firstly, the traditional DTC system of asynchronous motor is emulated in the environment of Matlab/Simulink. And the lack of the causes which affect the traditional direct torque control performance is deeply analyzed .Secondly, the hardware platform of direct torque control system of asynchronous motor is set up the digital signal processor of TMS320F2808-based. According to the results of system parameter setting calculation and the system performance requirements, DSP and other components are selected. And then, the hardware of main circuit and control circuit are completed. TMS320F2808-based asynchronous motor direct torque control system is achieved in the end. This system overcomes many disadvantages that TMS320F2407A and TMS320F2812 DSP are used to control direct torque control system, such as anti-interference, size etc. In this paper, hardware debugging is completed for the designed the various functional modules and joint debugging of the system with load transfer is finished. 100 W/550W/750 W motors are driven by system which based on direct torque control, SVPWM and other experiments. The experimental results show that the system has good compatibility and versatility.At last, The problem in conventional no-load test and blocked transfer experimental measurements is difficult to application in practical. The DC test, the single-phase test, and the no-load test are used to identify the parameter of experimental asynchronous motor on the designed control system. The experiment demonstrated that this proposed scheme can effectively eliminate the parameter identification error which is due to the skin and dead-time effects, beside the algorithm is simple, easy to implement and high-precision.