The Research And Implementation Of AC Motor Variable-frequency Speed Regulating System Based On DSP

With the continuous development of the electrical and electronical technology, electric drives act as extremely prominent function in modernization. In order to meet the requirements of high performance, environmental protection and energy conservation, AC variable-frequency speed regulating system with the special advantage is replacing the conventional direct current speed regulating system gradually. Thus AC variable-frequency speed regulating system makes the important role in the electric drives.This paper primarily introduced the research and implementation of AC motor variable-frequency speed regulating system based on DSP. Making use of the Texas Instruments'TMS320F240 that is special chip for motor control. And designed the motor driver and power source module.This paper expatiated that the mathematics models of AC motor is higher order, non-linear and closed coupling, multivariable input-output system. And introduces the principle and the algorithm of Sine Pulse Width Modulation (SPWM), opened-loop Space Voltage Pulse Width Modulation Control(SVPWM) and Field Oriented Control(FOC).Finally, realized the control strategies of variable-frequency speed regulating using assembly and C language. I also designed the DSP's minimum system for the sake of realize the system practicability.The paper shows the experiment results and wave-line analysis compared with the MATLAB/SIMULINK simulation. According to the test, the variable-frequency speed regulating system not only can regulate speed smoothly in 5~50Hz scope, but also have good dynamic and static performance. The test results confirmed that the design of variable-frequency speed regulating system is effectual and feasible.