| The content of this thesis studies is the spatial executive mechanism, a component which is used to control the attitude of satellite. The main principle of the mechanism is produce reaction torque by controlling the flywheel speed changes through the use of control module and the driving circuit, when it receives satellite command, so as to achieve the exchange energy with the satellite, and ultimately achieve the purpose of satellite attitude control.At first, this paper have investigated the situation of the research on the spatial executive mechanism at domestic and abroad. The main foreign manufacturers have developed USA ITHACO, RCA, TELDIX in Germany, SANIAS in France, and some other company in Russia, Japan, Holland etc. The USA and Germany in the field has the longest history, both have developed more than 30 years of experience. The domestic research is just beginning.Due to the spatial executive mechanism’s special working environment, its requirements of the reliability and the long life feature is much more strict than the conventional electronic products. This paper put forward a design scheme of control system based on DSP chip. The design of high intelligent brushless DC motor control system by using DSP series chip, can simplify the system structure, enhanced the reliability and security of system.Combined with the functions of satellites, to design the high precision integration spatial executive mechanism, and puts forward the requirements of design in detail. The spatial executive mechanism can implement high precision speed control and fast response to realize high precision control by using the brushless DC motor as the core structure, designing ofhardware circuit and software system combined with photoelectric velocity measurement technology, and controlling by the current loop and speed loop. This paper introduces the design of the control module, spatial actuator software, structure and reliability in detail. And it use the simulation software in the design process to do the simulation of structure and software, and the heat transfer analysis. It solved the working life, the stability of performance indicators. It make the working life is achieved.After complete the design, the spatial executive mechanism need to be debugging in the following three stages, the motor, the control system, and the principle of the prototype. The motor debugging and the control debugging is the process parameters detection, which ensure the mechanism take the correct output torque and control methods, and the whole machine debugging success. In the completed debugging assembly, performance test and data analysis of principle prototype, verify the actual index and design values of compliance, through test and comparison, the performance of the product is completely achieved the desired design goals. The control precision is lower than0.001 Nms, which is much better than the design target.With the development of technology, the satellite industry put forward the requirements of long-life, high-precision, wide-angle response of rapid mobility. As an important component of satellite, the space execution mechanism had higher request on precision and response time. For the satellite attitude control system, the high precision integration spatial executive mechanism own the advantage which the other types of executive components incomparable. Therefore, research on the technology of high precision, light and integration spatial executive mechanism will have very important significance and broad application prospect. |
