Design of Magnetic Bearing Reaction Wheel for High Precision Attitude Control of Spacecraft

In this paper, a kind of 5 degree-of-freedom magnetically suspended reaction flywheel with outer rotor is designed for high-precise stabilization of spacecraft attitude, the rotor velocity is -5000rpm to 5000rpm, its angular momentum is 50Nms. The main structure of this system is given, the rotor is supported by radial active and thrust active magnetic bearings with permanent magnet, a kind of integrated eddy- current sensor for detecting radial and axial displacement of wheel rotor is designed. And the optimization design method of rotor is presented to satisfy the require of strength safety coefficient and first elasticity resonance frequency simultaneously etc. by the software of multidisciplinary design optimization (iSIGHT) and Finite element analysis software (ANSYS).