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Abstract
The paper presents a theoretical analysis of different vibration control strategies of soft mounted induction motors with sleeve bearings, using active motor foot mounts. After the vibration model is presented, different controllers in combination with different feedback strategies are mathematically investigated. The focus is here on the forced vibrations, caused by dynamic rotor eccentricity—rotor mass eccentricity, magnetic eccentricity and bent rotor deflection. After the mathematically coherences are described, a numerical example is shown, where the forced vibrations caused by bent rotor deflection are investigated, for different control strategies, where the mass matrix, the stiffness matrix and the damping matrix are influenced by different control parameters. The aim of the paper is to show the mathematically coherences and the possibility to influence the vibration behaviour, by different control strategies to optimize the vibration behaviour of soft mounted induction motors.
Highlights
In praxis, large induction motors are often mounted on elastic steel frame foundations
The paper presents a theoretical analysis of different vibration control strategies of soft mounted induction motors with sleeve bearings, using active motor foot mounts
After the mathematically coherences are described, a numerical example is shown, where the forced vibrations caused by bent rotor deflection are investigated, for different control strategies, where the mass matrix, the stiffness matrix and the damping matrix are influenced by different control parameters
Summary
Large induction motors (rated power > 1 MW) are often mounted on elastic steel frame foundations. The idea is to use active motor foot mounts between the feet of large induction motors and soft steel frame foundations, to optimize the vibration behaviour of the induction motors on such soft foundations, which has been basically described in [20], but only for a special controller, an ideal proportional-derivative-controller (PD-controller), and only for a feedback of the vertical motor feet displacements and only for fixed controller parameters
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