The pointing driving mechanism of navigation satellite antenna is the key component to realize high precision, long-life and reliable pointing of satellite inter-satellite link antenna. To meet the requirement of mechanical environment in launching stage, satisfy the constraint condition of vacuum, high and low temperature and satisfy the special high precision and long-life requirement of intersatellite linkage antenna, a design method for improving accuracy and life of the driving mechanism was proposed based on the tandem assembly structure of stepper motor, harmonic reducer and encoder series and integrated shafting. The stress state and influencing factors of the pre-tightening shafting of the driving mechanism were analyzed in theory. The pre-tightening force, starting torque equivalent test and service life test for driving mechanism shafting were carried out, and the load characteristics of the designed driving mechanism were analyzed. The lock nut of the driving mechanism shafting was improved to optimize the force of driving mechanism shafting. To verify the correctness of the designed driving mechanism and its improved method, the precision test and life test under different thermal environments were carried out on the ground. Finally, it was verified that the driving mechanism for navigation satellite antenna could meet the requirements of on-orbit stable operation with high precision and long-life under special conditions. The analysis and the test of the pre-tightening force for mechanism shafting has significant engineering guiding significance.
Chinese Journal of Engineering Design