The rotordynamic and electromechanical modeling is illustrated taking into account the anisotropy of rotor elastic supports. This paper describes the design and construction of permanent magnet biased, actively controlled magnetic bearings for a flexible rotor. The technique is implemented on a rotor reproducing the typical dynamic behaviour of an aero-engine gas turbine shaft.
The theoretical development related to the bearing design is presented along with some experimental performance results.
The rotor was originally supported in fluid film bearings consuming as much as watts of power. A phase of experimental identification of actuator parameters is performed on the open-loop system response to improve the reliability of the model. The effectiveness of the proposed method is evaluated experimentally by measuring unbalance response in open and closed-loop configuration showing a reduction of displacement during critical speed crossing from 0.
The results include measurements of power consumption, load capacity, bearing linearized coefficients, and the dynamic response of the rotor.
The measured total power consumption, excluding shaft losses, was watts in the permanent magnet biased bearing.
Tribol 4Oct 01, 8 pages doi: The control design is described along with a sensitivity analysis on the most critical model parameters and a study of electromagnet nonlinear effects on the closed loop behaviour.
The results obtained with sensed and self-sensing controls are compared to show the good quality of the damping performance reached with the proposed self-sensing technique. For the magnetic bearing, both permanent magnets and electromagnets are used in a configuration which effectively provides the necessary fluxes in the appropriate air gaps to support the rotor.
Sensorless Active Magnetic Dampers for the control of rotors The aim of this paper is to present self-sensing Active Magnetic Dampers AMDs for the vibration control of rotating machines and evaluate their performance and advantages with respect to standard sensed solutions.
Received June 11, ; Revised December 14, ; Online January 24, Citing Articles Abstract Magnetic bearings have relatively low power consumption compared to fluid film and rolling element bearings. The proposed technique is based on a Luenberger observer that estimates the mechanical states of the system.
Furthermore, a classical AMD realized with the use of position sensors is implemented on the same rotor.in this paper. More than thirty years of research and application have led to active magnetic bearings (AMB). Active magnetic bearing can support a shaft, rotor without any physical contact and enables the user to precisely control shaft or rotor position.
The magnetic force used in magnetic bearings can be divided into two categories of how the force is created: reluctance force and Lorentz force. The reluctance force results from a difference of permeabilities between two materials.
The Lorentz force. RESEARCH PAPERS. Magnetic Bearing Design for Reduced Power Consumption. This paper describes the design and construction of permanent magnet biased, actively controlled magnetic bearings for a flexible rotor. The rotor was originally supported in fluid film bearings consuming as much as watts of power.
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Journal Overview. The bearing, NASA Glenn Research Center’s and Texas A&M research on magnetic suspension of Precision Radial Magnetic Bearing – American Society for PRECISION RADIAL MAGNETIC BEARING The goal of this research is to realize a magnetic bear- As the first step, this paper discusses aEssay on Science Research Papers.Download