Three-Phase AC Asynchronous Motor Based On DSP

AC motor frequency control methods in the aspect of frequency range,output performance,power factor,efficiency,dynamic response, speed precision, low-frequency torque, ease of use and ect. is better than that of the past.And its superiority is reflected in two aspects: one is the prominence of saving power;the other is the preeminent governing performance.Voltage space vector is based on motor unification principle,energy conversion and vector coordinate transformation theory. It has many advantages such as advanced, novelty and practicality. Firstly, by transforming coordinate,the stator current is decomposed into two DC parts which orientated as the rotator magnetic field and controlled respectively in this paper. So magnetic flux and torque are decoupled.It controls the asynchronous motor as a synchronous way. Secondly, the thesis designs the speed and current regulator which based on single neuron PI control method. And the thesis uses MATLAB simulation for the entire system, the simulation results shows that the control system has better stability and robustness. Thirdly, according to motor parameters required the thesis designs the main circuit of the inverter system, the current sampling circuit, speed detection circuit,overcurrent-overvoltage protection circuits,keyboard display circuit and built a digital processor TMS320F2812-based experimental platform.Finally,by using code composer studio(ccs)experimental platform,the thesis compiles the main program of the whole system and the program of the interrupt module. The thesis discusses the current sampling procedures and speed of testing procedures in details,which belongs to the interruption of programs SVPWM.The program of the whole system is run in the experimental platform. The digital oscilloscope measures SVPWM waveform at 50Hz.