Abstract
The paper presents a mathematical multibody model of a soft mounted induction motor with sleeve bearings regarding forced vibrations caused by dynamic rotor eccentricities considering electromagnetic field damping. The multibody model contains the mass of the stator, rotor, shaft journals and bearing housings, the electromagnetic forces with respect of electromagnetic field damping, stiffness and internal (rotating) damping of the rotor, different kinds of dynamic rotor eccentricity, stiffness and damping of the bearing housings and end shields, stiffness and damping of the oil film of the sleeve bearings and stiffness and damping of the foundation. With this multibody model, the bearing housing vibrations and the relative shaft vibrations in the sleeve bearings can be derived.
Highlights
Fast running induction motors with high power ratings, ( PN > 1 MW; nN ≥ 2900 rpm) are often equipped with sleeve bearings, because of the high circumferential speed of the shaft journals, and are often mounted on soft foundations (Figure 1)
The paper presents a mathematical multibody model of a soft mounted induction motor with sleeve bearings regarding forced vibrations caused by dynamic rotor eccentricities considering electromagnetic field damping
The multibody model contains the mass of the stator, rotor, shaft journals and bearing housings, the electromagnetic forces with respect of electromagnetic field damping, stiffness and internal damping of the rotor, different kinds of dynamic rotor eccentricity, stiffness and damping of the bearing housings and end shields, stiffness and damping of the oil film of the sleeve bearings and stiffness and damping of the foundation
Summary
Fast running induction motors with high power ratings, ( PN > 1 MW; nN ≥ 2900 rpm) are often equipped with sleeve bearings, because of the high circumferential speed of the shaft journals, and are often mounted on soft foundations (Figure 1). A steel frame foundation can be often characterized to be soft, because of the light weight. Vibrations of rotating machines are often an issue [1]-[10]. To guarantee a safe operation, the vibrations at the sleeve bearings are often monitored [1] [2] [3]. The relative shaft displacements between the shaft journals and the bearing shells are measured, using induction sensors. The bearing housing vibrations may be measured by accelerations sensors (Figure 2)
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