Abstract
Overhung rotors are widely used in the industrial field. However, compared with normal structure rotors, the prediction and control of overhung rotors cannot achieve good performance. The work aims to investigate the dynamical behaviours of an overhung rotor by means of correlation analysis, and find its possible application. In this work, based on a real type of rotor, the dynamic model of the rotor with overhang is established by means of the finite element method. Simulation of the dynamic model with different input positions and support stiffnesses is conducted. Based on the methodology of correlation analysis, by introducing a correlation parameter of a proportion of amplitude of measured signal and imbalance mass, the position which has most effect on the vibration is found. Meanwhile, an experiment on the same type of overhung rotor is carried out to validate the results. The numerical results and corresponding experimental results prove that the overhung node has the most effect on the vibration amplitudes of the measured points. Choosing the overhung node to add trial weight, the overhung rotor can be easily balanced. The theory provides an alternative approach to modal analysis which needs more knowledge of the system.
Highlights
Overhung rotors are found in many industrial applications
The mass and electromagnetic field of the overhung part would affect the dynamical behaviours of the rotor system
Rotors are carefully designed for fatigue loading and a high level of safety by using high-quality materials and precise manufacturing techniques, catastrophic failures occur in high-speed rotating machines, for the overhung rotor which has considerable weight
Summary
Overhung rotors are found in many industrial applications. Many works on rotors with overhung design have been reported. Many researchers have modeled and studied the dynamical responses of overhung rotors using different approaches. Koo et al [17] presented an analytical method based on transfer relations for an axial flux permanent magnet machine, while taking the overhang length into account. Kim et al [19] considered the overhang effect according to the various rotor types of permanent magnet machine is analyzed by using 3D magnetostatic finite element method. Yu et al [20] presented a novel outer rotor permanentmagnet vernier machine for in-wheel direct-drive application and introduced the overhang structures of the rotor and flux modulation pole. Seo et al [21] described the analysis and design of a spoke-type motor using ferrite permanent magnet. Based on the theoretical and experimental analysis, the discussion and conclusions are given
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
