Title: Dynamic behaviour of active magnetic bearings spindle in high-speed domain

Authors: Taissir Hentati; Amel Bouaziz; Slim Bouaziz; Jean-Yves Choley; Mohamed Haddar

Addresses: Laboratory of Mechanical Modeling and Production (LA2MP), National School of Engineers of Sfax (ENIS), University of Sfax, B.P. 1173, 3038, Tunisia ' Laboratory of Mechanical Modeling and Production (LA2MP), National School of Engineers of Sfax (ENIS), University of Sfax, B.P. 1173, 3038, Tunisia ' Laboratory of Mechanical Modeling and Production (LA2MP), National School of Engineers of Sfax (ENIS), University of Sfax, B.P. 1173, 3038, Tunisia ' Laboratory of Engineering in Mechanical Systems and Materials, SUPMECA, Saint-Ouen, France ' Laboratory of Mechanical Modeling and Production (LA2MP), National School of Engineers of Sfax (ENIS), University of Sfax, B.P. 1173, 3038, Tunisia

Abstract: High speed machining (HSM) is a new technology used to product parts in different sectors. This technology permits time and processing cost reduction. One of the principal components of the HSM is the spindle. It is generally supported by active magnetic bearings (AMBs), in order to guarantee the greatest speed without affecting the dynamic characteristics of the machine. In this paper, a spindle supported by two AMBs is modelled using the finite element method. It is discretised with Timoshenko beam finite element with different circular sections. Both flexible and rigid movements are taken into account. The non-linear electromagnetic loads exerted by bearings are computed in terms of the nominal air gap between bearings and spindle, the control current and the degrees of freedom of each node. A parametric study is performed to determine the influence of some parameters on the magnetic forces and subsequently the dynamic behaviour of the spindle.

Keywords: finite element method; FEM; rigid displacement; flexible displacement; coupling; nonlinear bearing load; active magnetic bearings; high speed machining; HSM; modelling; electromagnetics; magnetic forces; spindle dynamics.

DOI: 10.1504/IJMMS.2013.058527

International Journal of Mechatronics and Manufacturing Systems, 2013 Vol.6 No.5/6, pp.474 - 492

Received: 09 Nov 2012
Accepted: 03 Jun 2013
Published online: 12 Jul 2014 *

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