Affiliation:
1. School of Mechanical and Power Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Abstract
During the service process of a bearingless motorized spindle (BLMS), its parameters change with both time and external conditions, leading to a decrease in the accuracy of the motorized spindle. Therefore, it is difficult to accurately describe the dynamic performance of a motorized spindle during its actual operation using deterministic parameters. In this paper, the interactions between the thermal deformation and vibration of a motorized spindle are explored. A dynamic model of the motorized spindle based on multibody dynamics and time-varying parameters is established, and a solution method for the dynamic model with uncertain parameters is investigated. Firstly, the reasons for the vibration in the BLMS are analyzed, and the influences of thermal deformation on the thermal eccentricity and inhomogeneous air gap of the BLMS are studied. A vibration model of the BLMS is established and solved to acquire the radial vibration displacement. Secondly, a discrete multibody dynamics model of the BLMS is built, and the center trajectory of the motorized spindle is attained by solving the multibody dynamics model. A prototype experimental platform of the BLMS is designed, and vibration tests are carried out. The experimental results show that the vibration amplitude of the BLMS increases with the running time and the maximum displacement exhibits a large deviation from the simulation results using the determined parameters, while there is a small deviation from the simulation results using uncertain parameters; this indicates that the solution of the multibody dynamics model of the BLMS described by uncertain parameters is closer to the experimental data. These research findings can provide a reference for the optimized design of BLMSs.
Funder
National Natural Science Foundation of China
Key Project of Science and Technology Research Project of Chongqing Municipal Education Commission
National Key R&D Program Project
Project of Graduate Student Innovation Program of Chongqing University of Science and Technology
Reference39 articles.
1. Dai, Y., Tao, X., Li, Z., Zhan, S., Li, Y., and Gao, Y. (2022). A Review of Key Technologies for High-Speed Motorized Spindles of CNC Machine Tools. Machines, 10.
2. Progress in the Research of Reliability Technology of Machine Tools;Yang;J. Mech. Eng.,2013
3. Dynamic Design of a High-Speed Motorized Spindle-Bearing System;Jiang;J. Mech. Des.,2010
4. High-Speed Electrical Machines: Technologies, Trends, and Developments;Gerada;IEEE Trans. Ind. Electron.,2014
5. Review of Bearingless Motor Technology for Significant Power Applications;Chen;IEEE Trans. Ind. Appl.,2020