Design And Experimental Research On The Vector Control System Of Induction Motor Based On DSP

Vector control(VC) is based on motor unification principle, energy conversion and vector coordinate transformation theory. By transforming coordinate, the stator current is decomposing two DC parts which orientated as the rotator magnetic field and controlled respectively. So magnetic flux and torque are decoupled. It controls the asynchronous motor as a synchronous way. First of all, to an indirect vector control system of squirrel-cage induction motor, a simulation is made respectively using the M file method and the Simulink/Powerlib method. They have the characteristic severally. The operation principle of Simulink/Powerlib was analysed using state-space formulation. The math model of the induction motor is nonlinear, time varying and coupled, in the simulation model, classical PID and simple fuzzy control are respectively used and deeply studied. Simulation results demonstrates that the dynamic characteristic of fuzzy speed controller is better to PID controller, but it has the little error at steady-date. Secondly, using digital processor(DSP) TMS320LF2407, which is special for motor control, we develop a squirrel-cage induction motor experiment platform which based on VC principle. The intelligent power module(IPM), the detect circuit of current and motor speed, DSP and the program implement of the function module of the squirrel-cage induction motor vector control system are all presented particularly in this paper. Emphatically, the method that fuzzy and space vector(SVPWM) algorithm program on DSP is presented in detail. Finally, the three experiments that V/F open loop, V/F speed close loop, indirect vector control system are made on experiment platform, which show them mutual relation and analyse experimental result.