The Speed Mode Synergetic Control Approach for Magnetic Suspended Reaction Flywheel

Random torque disturbances generated by magnetic bearings eccentric magnetic force have negative effects on the output torque precision of the magnetic suspended reaction flywheel(MSRFW). In order to eliminate the negative effects, dynamic models of flywheel system including motor and the buck DC-DC converter are established and a synergetic control approach for speed mode operation is presented. This approach uses PI controller for speed operation and uses synergetic control theory to control the winding current of motor and the input current and output voltage of power converter, improving the robustness of the basic synergetic method in overcoming the random torque disturbance. Sufficient condition for synergetic control subsystem is certified by Lyapunov stability theory. Simulation and experimental results show that the presented approach has great robustness in torque disturbance and the output moment precision of the reaction flywheel system reaches up to 3×10−5N ·m.