Analysis on the Fundamental Properties of Active Magnetic Bearing Control Systems by a Transfer Function Approach.

Controllability and Observability of Parallel Magnetic Suspension Systems

“…Magnetic suspension using controlled electromagnets can realize various functions that are impossible for conventional mechanical suspension . A typical magnetic suspension system consists of the following components (see Fig.…”

“…This suspension technique has been used in various industrial fields such as Maglev system and active magnetic bearing (AMB) for complete contact‐free suspension of a rotating object . The most successful application is turbomolecular pump .…”

Low eddy loss axial hybrid magnetic bearing with gimballing control ability for momentum flywheel

“…Compared with conventional ball bearing flywheels, the magnetically suspended flywheel (MSFW) has advantages of no friction, free lubrication, low losses, and theoretically unlimited lifetime [4][5][6][7][8]. Flywheel generates attitude control torque by changing the rotational speed of rotor, this torque has high torque precision but cannot meet the maneuvering requirement fully for some space applications [9,10].…”

Stability analysis and imbalance compensation for active magnetic bearing with gyroscopic effects

“…Imbalance compensation has received a great attention [11]- [16], the imbalance compensation approaches fall into three categories, which are the clean displacement approach [11]- [13], the clean current approach [13]- [15], and the clean force approach [14]- [16]. The clean displacement approach can minimize the shaft displacement vibration through an added bearing stiffness with a high level of position precision, but it comes at the expense of high vibration force, whereas the clean force approach minimizes the vibration force but leads to a large vibration displacement, which endangers the system stability.…”

“…Compared with the clean force approach, the clean current approach can suppress most of the vibration force with less computational effort, less vibration displacement, and less power consumption. Additionally, it is structurally stable, and parameter variations in the controlled object are independent [15]. Compared with methods of fuzzy control [11], nonlinear decoupled disturbance observer [12], adaptive forced balancing [13], Furrier coefficient identification [14], generalized notch filter [16], the adaptive notch filter can reduce the computation effort or memory space [17], especial suitable for the MSCMG with a rotor at constant speed and many control tasks.…”