Analysis on the multi-dimensional spectrum of the thrust force for the linear motor feed drive system in machine tools. (1st January 2017)

• Record Type: Journal Article
• Authors: Yang, Xiaojun; Lu, Dun; Ma, Chengfang; Zhang, Jun; Zhao, Wanhua
• Is Part Of: Mechanical systems and signal processing. Volume 82(2017)
• Page Start: 68
• Page End: 79
• Publication Date: 2017-01-01
• Subjects: Linear motor feed drive system -- Thrust force spectrum -- Multi-dimensional variation -- Displacement fluctuation -- Machine tools; Structural dynamics -- Periodicals; Vibration -- Periodicals; Constructions -- Dynamique -- Périodiques; Vibration -- Périodiques; Structural dynamics; Vibration; Periodicals; 621
• DOI: 10.1016/j.ymssp.2016.05.006
• Languages: English
• ISSNs: 0888-3270

Abstract

Abstract: The motor thrust force has lots of harmonic components due to the nonlinearity of drive circuit and motor itself in the linear motor feed drive system. What is more, in the motion process, these thrust force harmonics may vary with the position, velocity, acceleration and load, which affects the displacement fluctuation of the feed drive system. Therefore, in this paper, on the basis of the thrust force spectrum obtained by the Maxwell equation and the electromagnetic energy method, the multi-dimensional variation of each thrust harmonic is analyzed under different motion parameters. Then the model of the servo system is established oriented to the dynamic precision. The influence of the variation of the thrust force spectrum on the displacement fluctuation is discussed. At last the experiments are carried out to verify the theoretical analysis above. It can be found that the thrust harmonics show multi-dimensional spectrum characteristics under different motion parameters and loads, which should be considered to choose the motion parameters and optimize the servo control parameters in the high-speed and high-precision machine tools equipped with the linear motor feed drive system. Highlights: Variation of thrust harmonics with the position was analyzed for direct drive system. Variation of thrust force harmonics with the velocity was analyzed. Variation of thrust force harmonics with the acceleration was analyzed. Variations of thrust harmonics with the indirect load and direct load were analyzed. Influence of the variation of thrust on the displacement fluctuation was discussed.