Hostname: page-component-76fb5796d-45l2p Total loading time: 0 Render date: 2024-04-26T23:14:23.411Z Has data issue: false hasContentIssue false
  • English
  • Français

Experimental investigations on the effectiveness of electromagnetic actuator as sensor

Published online by Cambridge University Press:  22 August 2013

Benjamin Defoy ,
Laurence Genty  and
Jarir Mahfoud

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The study aims at examining the behaviour of electromagnetic actuator as inductive sensor. The electromagnets are integrated in an alternative Wheatstone bridge and powered with alternative tension. This circuit allows the measurement of the electromagnet inductance variation, and as this variation is a function of the air gap, the displacement can be deduced. The effect of eddy currents is assessed in order to choose the suitable bridge frequency. Finally, a demodulator is used to obtain the tension proportional to the air gap value. The behaviour is assessed experimentally. Experiments are carried out on a simple beam; clamped at one end and simply supported at the other. The displacements could be measured by using four eddy current sensors and the inductive sensor. The inductive sensor displacement and a modal approximation of the four eddy current sensors resulting from impact testing are compared. Analysis of the results obtained predicts an efficient and robust behaviour.

Keywords

Self-sensingsensorselectromagnetic actuatorvibrationsexperiments
Type
Research Article
Information
Mechanics & Industry , Volume 14 , Issue 4 , 2013 , pp. 247 - 252
Copyright
© AFM, EDP Sciences 2013

References

G. Schweitzer, H. Bleuler, A. Traxler, Active Magnetic Bearings – Basics, Properties and Applications, vdf Hochschulverlag AG, ETH, Zurich, 2003
E.H. Maslen, Smart Machine Advances in Rotating Machinery, Proceeding of the 9th International Conference on Vibrations in Rotating Machinery, IMechE, Exeter, UK, 2008, pp. 3–14
G. Schweitzer, E.H. Maslen, Magnetic Bearings, Theory, Design, and Application to Rotating Machinery, Springer-Verlag, 2009
D. Vischer, H. Bleuler, A new approach to sensorless and voltage controlled AMBs based on network theory concepts, Proceedings of the 2nd ISMB, 1990
E.H. Maslen, Self–sensing for active magnetic bearings: overview and status, Proceedings of the 12th ISMB, 2010
L. Kucera, Robustness of self-sensing magnetic bearing, Proceedings of MAG’97 Industrial Conference and Exhibition on Magnetic Bearings, 1997
Thibeault, N.M., Smith, R.S., Magnetic bearing measurement configurations and associated robustness and performance limitations, ASME J. Dyn. Syst. Meas. Control 124-4 (2002) 589–598 CrossRefGoogle Scholar
Noh, M.D., Maslen, E.H., Self Sensing Active Magnetic Bearings Based on Parameter Estimation, IEEE Trans. Instrum. Meas. 46-1 (1997) 45–50 CrossRefGoogle Scholar
Mizuno, T., Araki, K., Bleuler, H., Stability analysis of self–sensing magnetic bearing controllers, IEEE Trans. Control Systems Technol. 4-5 (1996) 572–579 CrossRefGoogle Scholar
M. Brunet, B. Wagner, Innovation: Self-sensing technology, simplified mechanical design, In S2M News (2005)
H. Habermann, Paliers magnétiques, Techniques de l’ingénieur, traité Génie mécanique B 5 345, 1984
Mahfoud, J., Der Hagopian, J., Fuzzy Active Control Of Flexible Structures By Using Electromagnetic Actuators, ASCE’s Journal of Aerospace Engineering 24 (2011) 329–337 CrossRefGoogle Scholar
Der Hagopian, J., Mahfoud, J., Electromagnetic Actuator Design for the Control of Light Structures, Smart Structures and Systems 6 (2010) 29–38 CrossRefGoogle Scholar
J.-L. Charron, Mesures sans contact, Techniques de l’ingénieur, Mesures Analyses R1331, 2003