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Showing 1 to 20 of 26 for “"magnetic bearing"”.
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Magnetic bearing stages for electron beam lithography
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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System identification and control of magnetic bearing systems
… system model for the stabilisation of an Active Magnetic Bearing (AMB) System. Furthermore, the study reported here set out to design both conventional and advanced controllers based on the system model. This research report demonstrates that the literature on AMBs shows that AMBs are making …
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Magnetic bearing design for interferometric mirror-scanning mechanisms
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Control Designs for Low-Loss Active Magnetic Bearing: Theory and Implementation
Control Designs for Low-Loss Active Magnetic Bearings: Theory and Implementation Brian C. D. Wilson 327 Pages Directed by Dr. Panagiotis Tsiotras and Dr. Bonnie Heck-Ferri Active Magnetic Bearings (AMB) have been proposed for use in Electromechanical Flywheel Batteries. In these devices, kinetic …
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Pulsed field magnetization of composite superconducting bulks for magnetic bearing applications
… consumption, generators and also superconducting magnetic bearings used for applications such as flywheel energy storage. But even the most powerful rare-earth magnets are limited to a remanent field of 1.4 T, whereas superconducting materials such as YBCO in their bulk form have the extraordinary …
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Dynamic modelling and control of a magnetic bearing-suspended rotor system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1988.
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Transient response technique applied to active magnetic bearing machinery during rotor drop
The active magnetic bearing (AMB) is a relatively new technology which has many advantages compared with conventional bearing design. In an AMB system, the rolling-element back-up bearings are indispensable to protect the magnetic bearing rotor and stator, and other stationary seals along the rotor …
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Finite element based non-linear transient analysis of active magnetic bearing turbomachinery
The active magnetic bearing (AMB) is a relatively new technology in which the suspension forces are generated magnetically without any contact. Although there are many advantages of AMB technology over conventional bearing design, its major selling point is the claim of reduced maintenance and …
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The Experimental Testing of an Active Magnetic Bearing/Rotor System Undergoing Base Excitation
Active Magnetic Bearings (AMB) are a relatively recent innovation in bearing technology. Unlike conventional bearings, which rely on mechanical forces originating from fluid films or physical contact to support bearing loads, AMB systems utilize magnetic fields to levitate and support a shaft in an …
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Influence of active magnetic bearing sensor location on the calculated critical speeds of turbomachinery
… critical speeds for turbomachinery with active magnetic bearings (AMBs) is of great interest due to the increasing number of applications of this new technology. The potential for increased turbomachine performance through improved AMB design has created the need for a more accurate method for …
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Linear and nonlinear compensation techniques for control of a single degree of freedom magnetic bearing
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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Applications of adaptive controllers based on nonlinear parametrization to level control of feedwater heater and position control of magnetic bearing systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Analysis and feedback control of magnetic bearings with reference to flywheel energy storage.
In high speed applications magnetic bearings offer many potential advantages over mechanical bearings. The type of magnetic bearing most suitable for energy storage flywheels is selected and analysed for the purpose of designing feedback control loops. A nonlinear as well as a small signal linear …
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Internal Torques and Forces in Gyrostats with Magnetically Suspended Rotors
Active magnetic bearings have several potential applications in spacecraft design. Based on the gyrostat model, we develop equations that describe the internal torques and forces that occur between the body and one of the attached wheels. We evaluate the transverse torques for the torque--free …
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A novel magnetically levitated interior permanent magnet slice motor
A magnetically levitated motor, also known as a bearingless motor, combines the function of a magnetic bearing and motor to both levitate and rotate a rotor. This enables contact-free operation, which is advantageous in applications which require low friction, long operational lifetime, and high …
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Rotordynamic Analysis of Theoretical Models and Experimental Systems
… optimize the control algorithm for an Active Magnetic Bearing on an overhung</p> <p>rotor.</p>
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Optimization of superconducting magnetic bearings using finite element modeling
… the possibility of using superconducting bearings in large (3 - 100 MW) electric drives. Superconducting bearings are used to levitate the rotors inside electric drives via the Meiissner effect, whereby superconductors tend to repel magnetic flux. The Finite Element Method was used to …
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Study of the effect of sensor position on the forced response characteristics of rotors with active magnetic bearings
… better performance of turbomachinery with active magnetic bearings has necessitated a study of such systems for accurate prediction of their vibrational characteristics. This research presents a modification of existing transfer matrix methods for rotor analysis, to predict the response of rotor …
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Data center cooling using Aquifer Thermal Energy Storage (ATES)
… to evaluate two advanced cooling strategies. Magnetic bearing chillers (MBC) and MBC + aquifer thermal energy storage (ATES) against a conventional water-cooled centrifugal chiller plant with CRAH units for mid-sized data centers. Hourly cooling-energy and cost simulations were performed for …
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A methodology for evaluating and reducing rotor losses, heating, and operational limitations of high-speed flywheel batteries
… composite materials for flywheel construction, magnetic bearings for reduced wear and friction losses, and a low pressure environment to reduce windage losses. With the flywheel rotor suspended on magnetic bearings and operating in a partial vacuum, radiation becomes the primary heat transfer …
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