A Research On Variable Frequency Variable Speed Systems Based On TMS320LF2407A DSP

According to AC induction motor two - axis theory, space vector control speed separates the stator current into two components: one is the torque component, the other is the flux component. A structure similar to a DC machine structure where torque and field can be controlled independently is given. In this thesis, a voltage space vector control inverter based on DSPs is studied.This article has analyzed not only the PWM and the vector control principle but also the realization methods, on the pulse width modulation: we has mainly analyzed the basic principle,control method of SVPWM, on vector control: we has analyzed the vector control equivalent circuit and fundamental equation of three-phase coordinate systems, two static and revolution coordinate systems, the fundamental formula and charting for vector control is obtained. At last union basic principle of vector control, using MATLAB7.0/Simulink the vector control simulation model is got; In hardware, we take TMS320LF2407A DSP as the controller, and the digital interface and the simulation connection based on its EVM board are expanded. The digital interface completes the frequency assign, data display and so on. The simulation connection completes the current speed examination and the protection function. In the article the frequency conversion velocity modulation system to main circuit, intelligent power module PM25RSB120, the display circuit, the keyboard circuit, the protection circuit ,the TMS320LF2407A chip, the current and the speed examination circuit have been introduced in detail. At the same time using TMS320LF2407A DSP with the voltage space vector method, we has realized the SVPWM output successfully; In software, a set general assembly language for main program,order document and subprograms has been established. All the programs come true on the owner EVM board.The simulation indicates this article on the frequency conversion velocity modulation systems of vector control algorithm is successful, the vector control systems has the fine dynamic characteristic and the antijam characteristic. The SVPWM control based on the asynchronous machine circular magnetic field reduced the electrical machinery torque pulsation and the iron loss. Using the fast operation ability and fast real-time processing ability of high performance electrical machinery control of special-purpose DSP chip TMS320LF2407A makes the program come true easily. The good foundation for the next development for high performance vector control system has been laid.