Study And Design Of Turntable Stable Speed Control System Based On DSP

Airborne gradiometer is fast, economic and agile. It is not only important for earth measure, but also can be used in earth science, oil, nature gas and mineral resource exploration, which is an important physical geography exploration method. Precise testing platform is a key technique of gradiometer, drive system of rotate platform with precision machinery is composed by rotation axis, drive electro motor, incremental coder, conducting roll and working platform. Speed control precision of rotate platform is an important factor of airborne gradiometer. So it has important meaning to research high precision of speed stability control for gradiometer and other speed stability system.This paper take exactitude rotate platform as study object, using permanent-magnet DC motor as drive motor and TMS320LF2407A as control chip . aiming at speed stability with high precision , make a series of analysis and research from theory and actually, design a new soft phase-locked loop control system, an make detailed introduce for realization of system. At last, testing validity of method and making labor of test result.This paper includes six chapters, the configuration and content is:The first chapter is exordium, introduced the project's origin and research background ,analyzed correlation research actuality of system inside and outside of country. Introduced paper's main content, given anticipate parameter of system.The second chapter introduced elements of PWM timing control. And analyzed how to choose electro motor, gave math model of DC motor. Expounded unipolarity and bipolar PWM drive system of DC motor, and confirmed drive model of this system .Introduced main control chip of the system, which gave theory base of steady speed control of DC motor.The third chapter introduced control arithmetic and theory of PLL, analyzed the problems in frequency-phase detector of motor control, brought phase lock control of motor .Bought forward new soft PLL table control system which is based on analysis disadvantages of traditional speed phase lock. The paper introduced design and realization of new soft PLL control system.The fourth chapter introduced hardware of new soft PLL speed control system. First , gave whole collectivity block graph , then introduced circuit design of each module and circuit diagram.The fifth chapter introduced software of new soft PLL speed system. First introduced CSS, which the developing platform of DSP chip, second introduced program module of system, third introduced program flow chart of main module .Because the paper designed a new soft PLL, so introduced traditional soft PLL flow chart, which can be contrasted clearly.The sixth chapter introduced testing result of system. First introduced deferent wave of signal processing circuit of photoelectric encoder .Second introduced difference of speed stability by 900rpm and 600rpm of table speed .Introduced the result of new PLL control and frequency lock which was at 900rpm. At last, summed up the paper, introduced the work, brought forward disadvantage of system ,gave advices of next work.