Application Of Fuzzy Sliding Control Technology In AC PMSM

The PMSM AC servo system control method based on DSP is studied in this paper. First, the characteristics and modern control ways are introduced. Based on the reference in domestic and foreign, the sliding mode variable structure control and fuzzy control are analyzed. Combing their advantages, the fuzzy sliding variable structure control in application of PMSM is introduced. The limitation in sliding mode variable control is the harm brought by chattering. That's simulated by Matlab software. The bad effect is reduced by exponent reaching law, but it's not a control law resolving chattering. So the advantage of fuzzy control is analyzed and it's applied in modern AC variable speed control. Fuzzy control is not completely dispensable to the accurate model of PMSM. Moreover, it can overcome the influence of nonlinear factor. Furthermore, it's with fast reaction, insensitive to disturbance and it doesn't need online identification. The chattering is cleared by expert experience, thus resolving the harm brought by chattering. Because the strong robustness to changeable parameters and disturbance, the sliding mode variable control combined with the fuzzy control will be widely used in AC motor variable speed control system. It can resolve the problem the traditional control can't do, especially for multiple input, multiple output, nonlinear and strong coupling in time varying system. The control way above is used in modern times, the DSP is the result of microelectronics, digit signal process and computer technique. In servo control field, modern control theory with full digital control technique is the essential way for high performance servo control system. For the high speed calculating ability and particular hardware structure, DSP have taken place of computer and single-chip computer in many application systems. After learning the material about TMS320C2000 produced by TI company, the space vector control technique is studied by using TMS320LF2407A to design the hardware test platform. It provides the application software called CC to the C2XX integrated environment. The program is compiled by C language in this environment.The programs includes initial program, main cycle program, overflow program of magnetic field oriented control ,voltage and current sampling ADC interruption subprogram, PID control and fuzzy sliding mode control program. After the test, it can be applied in pratical projects.