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Showing 1 to 13 of 13 for “"Active Magnetic Bearings"”.
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System Identification and Calibration Techniques for Force Measurement in Active Magnetic Bearings
… the continuous feedback of force applied to the bearings that support the machinery. Such a system could be used to provide diagnostics for process monitoring in a manufacturing application or to provide information for machine health monitoring. Active Magnetic Bearings (AMBs) have the …
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A Multi-Point Measurement Technique for the Enhancement of Force Measurement with Active Magnetic Bearings (AMB)
Active magnetic bearings (AMBs) have the ability to act concurrently as support bearings and as load sensing measurement tools. Previous work in the area of AMB force measurement has relied upon basic magnetic equations requiring knowledge of coil currents and air gap lengths. Some researchers have …
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Active Magnetic Bearings used as an Actuator for Rotor Health Monitoring in Conjunction with Conventional Support Bearings
… the field of rotor health monitoring by using Active Magnetic Bearings (AMBs) as actuators for applying a variety of known force inputs to a spinning. Similar to modal analysis and other nondestructive evaluation (NDE) techniques which apply input signals to static structures in order to …
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Study of the effect of sensor position on the forced response characteristics of rotors with active magnetic bearings
… for 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 …
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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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Influence of active magnetic bearing sensor location on the calculated critical speeds of turbomachinery
… of 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 …
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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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Evaluation of the Effectiveness of an Active Magnetic Damper (AMD) in Damping Subsynchronous Vibrations in a Flexible Rotor
… must be paid to this type of vibration. Active Magnetic Bearings (AMBs) monitor the position of the shaft and change the dynamics of the system accordingly to keep the rotor in a desired position, offering the possibility of being used as dampers for vibration control. In the present …
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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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AUTOMATIC ON-LINE FAULT DETECTIONALGORITHM FOR HYDRAULIC TURBINES
… By mounting some acceleration transducers on the bearings of turbines, we can measure the vibration of the system and after that by doing some post processing; we can decide that the turbine’s condition is normal or no. Also sometimes we can discover the origin of the vibration, for example …
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Developments on Electrodynamic Levitation of Rotors
Magnetic bearings are systems capable of supporting rotors in absence of mechanical contact. Among many advantages with respect to ball and roller bearings are the possibilities of operating at extremely high rotational speeds and free of maintenance. Nevertheless, classical active magnetic …
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Testing of a Magnetically Levitated Rocket Thrust Measurement System Demonstrator for NASA
… direction. In response to these problems, a magnetically levitated thrust measurement system has been proposed and a 300lb capacity demonstrator has been designed and built. In this design, the magnetic bearings work concurrently as support bearings and force measurement devices. The …
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Self-bearing motor design & control
… efficiency and compact systems with integrated magnetic levitation for high speed and high precision applications. One of the major disadvantages of existing self-bearing motors for high speed application is their rotor mechanical construction. Either the permanent magnet or induction machines …