Multi-mode Switching Control And Dsp Implementation For Turntable

Research and production of turntable have great significance for aeronautic and astronautic industry and defense construction. On the background of a servo turntable, this paper studies a new control strategy as well as associated hardware and software design, and achieves high accuracy control requirement.The traditional coarse and fine dual-mode control technique for servo turntable has been widely used in practical engineering. To a certain extent, this technique has proven to be capable of satisfying the performance requirements by vast simulations and practices. However, the switch rule is usually determined by practical experience and be lack of theoretical guidance. In face of uncertainties, the good control performance and stability can no longer be guaranteed. Consequently, the practical debug would encounter great difficulty. In order to deal with this problem, the paper presents a new turntable control design method based on switch control technique. Considering the practicability of dynamic output feedback, this paper studies dynamic output feedback H_∞switch control algorithm, and employs the theoretical results to redesign the control system for the servo turntable. This design method not only achieves the same closed-loop performance as the traditional coarse and fine dual-mode control, but also can guarantee the closed-loop stability when controller switches. Simulation results verified the effectiveness of the application.Finally, as the core controller, TMS320LF2407A is used for designing the hardware of angular measurement and feedback and digital control system. Also, the programs of coarse and fine coupling and digital control algorithm are compiled based on assembly language. It proves by actual debugging that the digital control system in this paper is good for improving the dependability of the turntable, and that all algorithms above-mentioned completed in the sampling period less than 0.2ms greatly improve real-time of control system. The paper laies the foundation for further improving the turntable control performance.