Tethered Platform Retractable System Electronic Control System

Mooring balloon as an information platform has many advantages, such as low use-cost, long hang time and good invisible properties, having become a researching focus in recent years. In the mooring balloon system, it's the properties of retractable mooring platform, also called the properties of winch that influence not only the security and reliability of the whole system, but also the service life of the cable and transmission performance of electrooptical signal. In modern times,winch system is developing towards the direction of longer length, bigger tension, so the speed precise control and the effective protection of the cable system have been two constraint bottlenecks of it. As to the winch with the above problems, we propose a program to control AC motor with Inverter to realize electric winch system with reducing tension mechanism we also did deeper theoretical and practical research into vector frequency conversion system ,reducing tension mechanism and constant tension system .Besides, we did further analysis of the reliabilities of the system. They have great theoretical value and practical engineering significance.Based on the analysis of the structure of this electric winch, we did a more step to research the electric system. The proposal of reducing tension mechanism program solves the problem with broken cable during the application by applying the friction theory,depending on friction force between cable and friction wheel to share the mostly tension, so that when cable wind to the reservoir winch, the tension on the rope can stay relatively stable, as a result the rope can be effectively protected. Inverter is used to control the torque and speed of the reservoir winch and the winch. The reliability of the system is analysed, based on the application of the weighted distribution method for reliability index of the electric winch system, identify the reliability of the weak links in order to improve our design effectively.While researching on theory, we also design the models of speed control of electro-controlling winch and constant tension mechanism experiment, and the corresponding test. Theoretical and experimental results show that the application of the frequency vector control for electric winch has the advantages of fast response, simple parameter adjustment, anti-interference ability, etc., and maintain the cable tension constant.