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- Title
Dynamic modeling and analysis of the nut-direct drive system.
- Authors
Wang, Zhaoguo; Feng, Xianying; Li, Peigang; Du, Fuxin
- Abstract
For ball screw feed system, it has been a common practice that screw shaft is typically supported by bearings at both ends and is driven by a servo motor through coupling. However, this drive method has a relative low dynamic rigidity due to the influence of the support bearings. In this study, the nut-direct drive system is proposed, where the screw shaft is fixed at both ends and the screw nut is driven by the hollow servo motor through the bolted flange. In order to analyze the advantages of the nut-direct drive system compared with the classical drive, the dynamic models of the classical drive and the nut-direct drive are established based on lumped parameter method, respectively. According to the lumped parameter method, the influence of the table position, the length of screw shaft, and the nominal diameter of screw shaft on the natural frequency are analyzed. Furthermore, to analyze the influence of the mechanical system on position tracking accuracy, the mechanical systems of the classical drive and the nut-direct drive are integrated into the control system using the same control parameters, respectively. Results indicate that the nut-direct drive has faster responsiveness and better position tracking accuracy compared with the classical drive.
- Subjects
DYNAMIC models; RIGIDITY (Psychology); FREQUENCIES of oscillating systems; MACHINE tools; LUMPED parameter systems
- Publication
Advances in Mechanical Engineering (Sage Publications Inc.), 2018, Vol 10, Issue 11, p1
- ISSN
1687-8132
- Publication type
Article
- DOI
10.1177/1687814018810656