The Research And Realization Of AC Induction Motor's Variable-frequency Speed Adjusting System Based On DSP

With the development of power electronic technology, and as well as different kinds of new control models and advanced control methods used in motor speed control system, the accuracy of AC motor control system has been significantly improved. To meet the requirements of high-performance, energy saving and environmental, AC motor converter is gradually replacing DC converter in the field of electric drive and plays an important role with its unique advantage.The main topic of this paper is to introduce and discuss AC induction motor frequency variable control system, and the corresponding hardware and software design will be mentioned as well. One solution is to use TI's motor control chip DSP TMS320LF2407A together with V/F and SVPWM control methods to control AC induction motor frequency variable control system.A mathematical model of induction motor and VVVF principle are given in this paper; A control circuit with a minimize DSP system as the core and main inverter circuit and signal acquisition circuit are designed here; Make the above Frequency Control Strategy into actualization using C language in the environment of CCS; Meanwhile, in order to achieve the flexibility of the control system, VC++ PC control program is also used. The system can be controlled by a PC via the serial port, and the motor running states can be displayed on the PC screen; To facilitate the multi-motor control and realize the remote control, the CAN bus is also extended.Finally, the experimental results and waveform analysis are given in this paper. The results showed that the VVVF control system has good speed static and dynamic performance, the effectiveness and feasibility of the designed system is proved.