Research On Correcting Control Of Multi-layer Membrane

With the continuous improvement of scientific technology, the degree of automation of production line is more high. Winding, unwinding, transfer, stitching, cutting, lamination and other operations are primarily automated in membrane processing production line. Reel material will often deviate in the process of unwinding and transmitted due to various reasons.It will affect product quality and process requirements. And it results in economic losses unnecessary. Therefore, it is essential to produce the correcting control equipment for Membrane formation.Firstly, the primary control tasks of multilayer membrane fit automatic winding machine are researched in the paper. The deviating membrane reasons, the correcting control system components and the principle of all aspects of the system are analyzed. The ultrasonic sensor and the permanent magnet synchronous motor are selected by comparing the advantages and disadvantages of the kinds of sensors and implementing agencies in the correcting control system. Then, the system transfer function model is established through the analysis of all aspects of the system.Secondly, the hardware and software design of the multilayer membrane correcting control system are discussed in detail. TI’s TMS320F2812chip as a control core in the system. The hardware circuit section are designed on this basis. For example, current sampling circuit, over current protection circuit, the encoder interface circuit, RS232communication circuit, IPM module and drive circuit, soft starting circuit, the main circuit over-under-voltage protection circuit and so on; The program design is modular in design thinking in system software design. The main program and the three interrupt service program are designed. The interrupt service routine is composed of many sub-program modules. Include:the timer interrupt program, the current sampling subroutine, SVPWM subroutine, capture interrupt subroutine, power drive protection interrupt subroutine and so on. The subroutine modules complete the control tasks of the entire control system. And the corresponding program flow charts are given.Finally, the correcting control strategy is researched by analyzing the nonlinear characteristics of the correcting control system. Considered the advantages and disadvantages of the various control strategies, a position adjustment of the fuzzy control algorithm is put forward which can adjust the PI parameters on line. By building the system model in MATLAB software, the fuzzy adaptive PI control algorithm the traditional PID control algorithm have an influence on the control system stability, steady-state accuracy and the rapid response of dynamic state. The simulation results show that the fuzzy adaptive PI control algorithm has a better performance.