Results 261 to 270 of about 64,908 (298)

The dynamics of a cracked rotor with an active magnetic bearing

Journal of Sound and Vibration, 2001
The dynamic characteristics of a cracked rotor with an active magnetic bearing (AMB) are theoretically analyzed in this paper. The effects of using optimal controller parameters on the dynamic characteristics of the cracked rotor and the effect of the crack on the stability of the active control system are discussed.
Changsheng Zhu, David A. Robb, David J. Ewins   +2 more
openaire   +1 more source

On Active Magnetic Bearing Control with Input Saturation

Proceedings of the 44th IEEE Conference on Decision and Control, 2006
We study the low-bias stabilization of active magnetic bearings (AMBs) subject to voltage saturation based on a recently proposed model for the AMB switching mode of operation. Using a forwarding-like approach, we construct a stabilizing controller of arbitrarily small amplitude and a control-Lyapunov function for the AMB dynamics.
Frédéric Mazenc, Marcio S. de Queiroz, Michael Malisoff   +2 more
openaire   +1 more source

The Analysis of Radial Magnetic Bearing’s Magnetic Field in Active Magnetic Bearing Electric Spindle Unit

Advanced Materials Research, 2011
Introduced the working principle of active magnetic bearing unit and took the electric spindle with 5.5kW for example, finite element analysis of the magnetic fields of radical magnetic bearing was analyzed through finite element analysis by ANSYS software to find out the variation of magnetic field distribution and affecting factors.
Ping Liao, Su Yang Ma, Guo Qing Wu, Jing Feng Mao, An Dong Jiang   +4 more
openaire   +1 more source

NONLINEAR DYNAMIC BEHAVIOR OF A ROTOR ACTIVE MAGNETIC BEARING

International Journal of Bifurcation and Chaos, 2010
The nonlinear dynamic behavior of a rigid disc-rotor supported by active magnetic bearings (AMB) is investigated, without gyroscopic effects. The vibration of the rotor is modeled by a coupled second order nonlinear ordinary differential equations with quadratic and cubic nonlinearities.
Hongkui Chen, Usama H. Hegazy
openaire   +2 more sources

Fuzzy Controllers for Active Magnetic Bearings

IFAC Proceedings Volumes, 2000
Abstract The design of a fuzzy logic controller for a magnetic bearing is presented. Parameters defining the controller are selected with the aid of a multiobjective genetic algorithm. Unexpected results are discovered which show that novel controllers emerge from what is described in this paper as an 'unconstrained' search technique.
G.M. Allan, P. Schroder, P.J. Fleming
openaire   +1 more source

Decentralized Control for Active Magnetic Bearings

2006 12th International Power Electronics and Motion Control Conference, 2006
In the paper a decentralized control for active magnetic bearings is discussed. For the numerical evaluation of different control algorithms a mathematical model of the controlled plant is determined. For this reason basic characteristics and fundamental operation principle of magnetic levitation as well mathematical model of the rigid shaft are ...
J. Ritonja, B. Polajzer, D. Dolinar
openaire   +1 more source

Unbalancing estimation in active magnetic bearings

Proceedings of IEEE Systems Man and Cybernetics Conference - SMC, 2002
This paper deals with state reconstruction of a discrete linear time varying system which is influenced by constant disturbance adding to control input, and sinusoidal perturbations on measure signals. The process under consideration is composed of a horizontal rotating shaft, suspended by means of active magnetic bearings, that requires a control ...
P. Mouille, J. Lottin
openaire   +1 more source

Active magnetic bearings for sodium pump

2014 Annual International Conference on Emerging Research Areas: Magnetics, Machines and Drives (AICERA/iCMMD), 2014
Centrifugal Pumps are used in the primary and secondary heat transport systems of fast reactors for pumping liquid sodium. Lubrication oil leakage from the conventional bearings used in these pumps is a potential threat to cause reactivity changes which could result in extended reactor shut down.
R. Nirmalkumar, B. K. Sreedhar, G. Padmakumar, K. K. Rajan   +3 more
openaire   +1 more source

Development of an active superconducting magnetic bearing

IEEE Transactions on Appiled Superconductivity, 1995
The potential use of YBa/sub 2/Cu/sub 3/O/sub 7/ as an active component in a magnetic bearing is being investigated. Measurements are being made of the load bearing capacity and related stiffnesses in comparison to predictions from the critical state model.
T.A. Coombs, A.M. Campbell, D.A. Cardwell   +2 more
openaire   +1 more source

Fuzzy control schemes for active magnetic bearings

1993
Active magnetic bearings are used in applications where ordinary bearings meet difficulties. Due to nonlinear structure of active magnetic bearing system fuzzy logic control gives an attractive choice to control these systems. In this paper a fuzzy derivate gain adjusting method for active magnetic bearing control is presented.
openaire   +2 more sources