(4) A prototype hybrid magnetic bearing is manufactured in the application of 15Nms satellite attitude control and energy storage flywheel system which can operate stably up to 25000r/min. The compared experiments are carried out between the flywheel system suspended by the prototype hybrid magnetic bearing and suspended by the active one.

(4) A prototype hybrid magnetic bearing is manufactured in the application of 15Nms satellite attitude control and energy storage flywheel system which can operate stably up to 25000r/min. The compared experiments are carried out between the flywheel system suspended by the prototype hybrid magnetic bearing and suspended by the active one.

The performance of this system with crossfeedback control is analyzed by experiments and compared with that under decentralized proportional integral differential (PID) control only.

The experiments show that the system under decentralized PID control is unstable at 12 000 r/min, while that with crossfeedback control is still work normally at 25 000 r/min.

Permanent magnetic bearing and the hydrodynamics spiral groove bearing are utilized as supports for the energy storage flywheel rotor system. The rotor dynamics of flywheel energy storage system with a hybrid permanent magnetic mechanical bearing is studied. The kinetic energy, potential energy and the energy dissipation functions of the whole system are obtained, and the rotor equation of motion is derived by using Lagrange Maxwell's equation, the analytical solution of the equation is obtained by using state...

Permanent magnetic bearing and the hydrodynamics spiral groove bearing are utilized as supports for the energy storage flywheel rotor system. The rotor dynamics of flywheel energy storage system with a hybrid permanent magnetic mechanical bearing is studied. The kinetic energy, potential energy and the energy dissipation functions of the whole system are obtained, and the rotor equation of motion is derived by using Lagrange Maxwell's equation, the analytical solution of the equation is obtained by using state vector method. The critical speed, modal damping, and the amplitude frequency characteristics are simulated. Based on the numerical simulation, the dynamic parameter of flywheel rotor system is optimized. A flywheel energy storage system is developed, which can arrive at 48 000 r/min and store the energy of 0.3kWh. Experimental result shows that the system can run up to the designed speed steadily, the dynamic characteristics is in agreement with the theoretical one.

A control method, crossfeedback control, is studied to restrain gyroscopic effect of a magnetic bearingsupported flywheel system. The stability of the system is analyzed under crossfeedback control. The results show that the gyroscopic effect could be restrained by using this method and the system keeps stable when the rotation speed is over some critical value which is relative to the moments of inertia of the rotor and could be adjusted by the parameters of the controller according to the requirements...

A control method, crossfeedback control, is studied to restrain gyroscopic effect of a magnetic bearingsupported flywheel system. The stability of the system is analyzed under crossfeedback control. The results show that the gyroscopic effect could be restrained by using this method and the system keeps stable when the rotation speed is over some critical value which is relative to the moments of inertia of the rotor and could be adjusted by the parameters of the controller according to the requirements of applications. The performance of this system with crossfeedback control is analyzed by experiments and compared with that under decentralized proportional integral differential (PID) control only. The experiments show that the system under decentralized PID control is unstable at 12 000 r/min, while that with crossfeedback control is still work normally at 25 000 r/min. Therefore, this method could restrain the gyroscopic effect effectively.

For a magnetic-bearing-supported high-speed flyw-heel with significant gyroscopic effects, its nutation and precession modes greatly influence stability of a system at high rotational speeds. To make a rotor running at a high rotational speed, its nutation and precession modes should be restrained effectively. But for such a rotor, traditional PID controllers are not suitable any more. A method called magnetic force lead control is created to restrain the nutation mode of a flywheel rotor. And a displacement...

For a magnetic-bearing-supported high-speed flyw-heel with significant gyroscopic effects, its nutation and precession modes greatly influence stability of a system at high rotational speeds. To make a rotor running at a high rotational speed, its nutation and precession modes should be restrained effectively. But for such a rotor, traditional PID controllers are not suitable any more. A method called magnetic force lead control is created to restrain the nutation mode of a flywheel rotor. And a displacement cross feedback with a low-pass filter is added to restrain the precession mode. Analysis results, simulation results and some experimental results about the method are provided. They all show the effects of the method.