Precision control of double-gimbal magnetically suspended control moment gyros

This work proposes a state-dependent Riccati equation (SDRE) design for precision control of a double-gimbal magnetically suspended rotor (MSR) control moment gyroscope (CMG) in presence of high nonlinearities, strong coupled dynamics, and disturbance arising from double-gimbal movement. The control moment gyroscope is the primary attitude control actuator for spacecraft. Due to merging of magnetic bearings benefits with double-gimbal CMG, the double- gimbal MSR- CMG possesses high precision, zero friction, small libration, active vibration suppression, and long life. Moreover, a coupled SDRE control is applied for MSR-CMG to decrease the influence of the unmodeled dynamics in differential geometry decoupling modeling of double-gimbal MSR-CMG based on current mode. The capability of the proposed method is confirmed by outstanding results of simulation.