Satellite roll-yaw axis attitude stable control based on magnetically suspended momentum wheel with vernier gimballing capacity

Satellite roll-yaw angles stable control using magnetically suspended momentum wheel (MBMW) with vernier gimballing capacity is investigated. Based on the formulated dynamics equations of rotor and satellite considering orbit angular velocity, an attitude controller for satellite roll-yaw motion control involving double control loops is designed: the outer control loop generate values of the reference gimballing angles according to the roll axis attitude angles of the satellite, and the inner loop control the MBMW's gimbal angles to be stable while it exchanges angular momentum with the spacecraft main body. Stability of the control system is analyzed and simulation is performed to verify its validity. Yaw angular error can achieve pointing accuracy of 0.08° and stability of 0.0001°/s respectively under condition of given disturbance condition and without yaw angle sensor.