Affiliations: [a] Laboratory of Mechanical Modeling and Production, National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia | [b] Laboratory of Engineering in Mechanical Systems and Materials, SUPMECA, Saint-Ouen, France
Correspondence:
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Corresponding author: Slim Bouaziz, Laboratory of Mechanical Modeling and Production (LA2MP), National School of Engineers of Sfax (ENIS), BP.1173, 3038, University of Sfax, Tunisia. Tel.: +216 74 274 088; Fax: +216 74 666 535; E-mail:slim.bouaziz1@gmail.com
Abstract: The use of Active Magnetic Bearings (AMBs) in the High Speed Machining (HSM)
field is increasing. In fact, they have important advantages such us: high
speed which can reach 150000 rpm, high stiffness and absence of lubrication.
Indeed, these bearings operate through magnetic interaction generated
between the stator and the rotor. The spindle, principal component in the
HSM, supported by AMBs, is considered as a source of vibration in machine
tool spindles when it is affected by some defects during their functioning.
These defects can affect either the rotor of the spindle like the unbalance
defect, or the AMBs such us misalignment of bearings, failure of actuators,
sensors, amplifier and also the eccentricity defect. This paper studies the
influence of spindle or AMBs defects on the dynamic behavior of a spindle
supported by two AMBs. The system modeling is based on the finite element
method. Four degrees of freedom is used and the coupling between elastic and
rigid displacements is taken into account.
