Research And Design Of Servo Circuit For Magnetically Suspended Control Moment Gyroscope Gimbal

Compared with the traditional control devices, control moment gyroscope (CMG), novel pose control device with greater and more precise output torque, is suitable for the great mass and more precise satellite. The application of control moment gyroscopes is still in the exploratory stage in our country. With the rapid development of space technique, research and fabrication of control moment gyroscopes has become an important subject in the space industry.Firstly, the CMG development is discussed, and the domestic development and the foreign CMG development have been analyzed and compared. The overseas CMG practical application is briefly introduced. Then, the main theory is in detail elaborated, and the analysis and the model simulation for the single gimbal control moment gyroscope has been carried out. The friction influence on gimbal control system is investigated. The digital process circuits for the gimbal control system are designed with DSP and the CPLD chip with high performance. TI Corporation's high performance 32 floating point DSP processor TMS320VC33 is applied to process the data. The RS422 serial port communication circuit, the signal sampling circuit, 16 bit data memorizer and 32 bit data bus are designed with XILINX Corporation's CPLD chip XC3512XL. The special watch-dog monitoring circuit, the DC/DC power circuit, the difference level and the TTL level switch electric circuit are designed, and the corresponding PCB domains are presented. The gimbal control algorithm and the DSP boot-loader procedure are designed with C and the assembly language.The designed circuit and the software procedure are confirmed and debugged with the +5V power supply. The whole debugs for the circuit and the control algorithm are carried out in the hot vacuum environment. The experiment results show the designed circuit and the control algorithm satisfies the requirements.