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Development of Automatic Locking Device for Magnetic Bearing Flywheel

Author: YuLiHui
Tutor: LiuXiaoDong
School: Tongji University
Course: Mechanical Manufacturing and Automation
Keywords: magnetic bearing flywheel step motor motion control Microcontroller force sensor
CLC: V448.2
Type: Master's thesis
Year: 2007
Downloads: 69
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Abstract

Magnetic suspending is a technology, which utilizes magnetic power to make objects suspending without mechanical touching, it is also an all-around technology relating to several subjects. Nowaday, the controlling of a satellite stance is usually achieved by controlling the change of the angular momentum for a flywheel. The system of magnetic bearing flywheel has several characters, such as without friction, dispensing with lubrication and high-speed running, and it is applied in satellites very much.During the satellite launching, the locking of Magnetic bearing flywheel is a key technology. In order to protecting flywheel from being damaged, the system of magnetic bearing flywheel, including the flywheel rotor, needs to be locking during the satellite launching, and in the orbiting of the satellite, it also needs to be loosing to make the rotor suspending. Although the static magnetic force of the magnetic bearing could maintain the rotor during the satellite launching, it utilizes additional locking device in many business applications of magnetic bearing flywheel. It can provide locking force for flywheel by locking device during launching to make the rotor fixing on the surface of the taper bush, and loose it in the satellite orbiting to make the rotor suspending as the free state.First, the motion mechanism is designed, which consists of power supply, transmission part, implement part and sustentation part, and a whole project of mechanism could be obtained according to this. In the locking project designing of the mechanism, several projects are enumerated, and an optimal one has been selected through comparing them with each other. Then the motion control system is designed. In order to controlling the mechanism motion efficiently, a control system with an active feedback loop is chosen, which could ensure implement part working in its safe journey. Obviously, in order to making the mechanism automatic locking and loosing, a molectron, core of microcontroller, is designed, and a long-distance control is achieved by utilizing serial communication module, which could transfer the information between microcontroller and main computer.When the mechanism and its control system are designed, an experiment of the system could be maken on, and it could not only adjust the locking force of the mechanism efficiently, but also optimize the whole system and bring its capability reaching optimization level.At the end of this paper, it summarizes all of the development of the automatic locking system, and prospects the next further research.

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