.... Editor: M. Porfiri. 28 03 2014 13 08 2014 Multiple objective genetic algorithms (MOGAs) simultaneously optimize a control law and geometrical features of a set of homopolar magnetic bearings (HOMB) supporting a generic flexible, spinning shaft. The minimization objectives include...

... experimentally with success for the control of an academic test rig. It is adapted here for the control of an industrial compressor whose flexible rotor is supported by active magnetic bearings (AMB). At this stage, only numerical investigations are performed. The controller has to satisfy the standards...

...Jiang Kejian; Zhu Changsheng; Tang Ming The undesired synchronous vibration due to rotor mass imbalance is a main disturbance source in all rotating machinery including active magnetic bearing (AMB)-rotor systems. In the AMB-rotor system, imbalance compensation, which causes the AMB actuators...

... simultaneously using magnetic bearings. A two-stage weighting strategy is developed, involving base weightings calculated by using a singular value decomposition of the system’s receptance matrices and an adjustable single weighting parameter tuned automatically to shift the balance between the two objective...

...Hans A. DeSmidt; K. W. Wang; Edward C. Smith Active magnetic bearings (AMBs) have been proposed by many researchers and engineers as an alternative to replace traditional contact bearings in rotor and driveshaft systems. Such active, noncontact bearings do not have frictional wear and can be used...

... transfer and attitude control (IPAC), that are effective even with low stiffness active magnetic bearings (AMBs) and flexible satellite appendages. The flywheel AVC and levitation tasks are provided by a multiple input–multiple output control law that enhances stability by reducing the dependence...

... of Mathieu Functions , Clarendon , Oxford. Newland , D. E. , 1989 , Mechanical Vibrations Analysis and Computation , Longmans , Green, New York. Bassani , R. , and Ciulli , E. , 2005 , “ Passive Magnetic Bearings. Low Instability and Possible Stability ,” 3° World Tribology...

... identification, and realizes the combined advantages of both. Simulations and experimental demonstrations conducted on an active magnetic bearing test rig confirm these capabilities. The combat hybrid power system (CHPS) flywheel alternator, with “inside out” AMB Despite their advantages, AMBs...

...Eric H. Maslen; Dominick T. Montie; Tetsuya Iwasaki Self-sensing magnetic bearings use measurements of voltage and current in electromagnets to estimate the position of a magnetically levitated object. By estimating position in this manner, explicit proximity sensors are eliminated, along...

...Tingshu Hu; Zongli Lin; Wei Jiang; Paul E. Allaire We study control problems in magnetic bearing systems that are subject to both input and state constraints. Apart from the usual restrictions on voltages and currents in the circuit systems, most magnetic bearing systems are subject to a severe...

...Nancy Morse Thibeault; Roy S. Smith We obtain bounds on achievable sensitivity and complementary sensitivity reduction for a magnetic bearing system in three measurement configurations. We use the sensitivity reduction bounds to deduce achievable robustness and performance limits for each system...

...Joga D. Setiawan, Graduate Student; Ranjan Mukherjee, Associate Professor; Eric H. Maslen, Associate Professor, Sensor runout and unbalance are the dominant sources of periodic disturbances in magnetic bearings. Many algorithms have been investigated for individual runout and unbalance compensation...

... applications. Habermann, H., and Liard, G., 1979, “Practical Magnetic Bearings,” IEEE Spectr., IEESAM Sept., pp. 26–30. Allaire , P. E. , Lewis , D. W. , and Knight , J. D. , 1983 , “ Active Vibration Control of a Single Mass Rotor on Flexible Supports ,” J. Franklin Inst. , 315 , pp...

...T.-J. Yeh; Ying-Jer Chung; Wei-Chung Wu This paper proposes a sliding control scheme to deal with the nonlinear, uncertain dynamics of magnetic bearing systems. The controller is designed based on the Thevenin equivalent of a network model that characterizes both the main electromechanical...

...Joga D. Setiawan, Graduate Student; Ranjan Mukherjee, Associate Professor; Eric H. Maslen, Associate Professor The problem of sensor runout in magnetic bearing systems has been largely overlooked due to similarities with mass unbalance in creating periodic disturbances. While the effect of mass...