The Structure Design Of Magnetic Suspension Momentum Wheel With Deflection Angular Momentum

Now, flywheels systems are elected as the actuators of attitude control system with high precision for most spacecrafts. The magnetic suspension momentum wheel has better performance than the conventional ball bearing momentum wheel, and one gimbaling magnetic suspension momentum wheel whose rotation axis can be deflected can perform three axes attitude stability and control of spacecraft in high precision.The paper describes the basic structure of a gimbaling magnetic suspension flywheel with outer rotor, which employs a spherical magnetic bearing to support its flywheel rotor and three axes linear movement, and use moving magnet type linear DC motor to turn the spin axis. The 5D movement of the rotor can be decomposed into two parts, one is translation alone three axes, and the other is rotation movement around the axes. The calculation expressions of electromagnetic support forces of the spherical magnetic bearing and the calculation expressions of turning moment for the spin axis of flywheel rotor are presented. The dynamic model in radial translation and in rotation, as welll as the movement simulation with the widely used control method PD was proposed independently.The study indicates that the gimbaling magnetic suspension flywheel presented in this paper has original structure, its rotation axis can be leant in large range of angle, satisfied the demand of the design object.