Investigation on the displacement fluctuation of the linear motor feed system considering the linear encoder vibration |
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| Affiliation: | 1. School of Mechanical Engineering, Xi''an Jiaotong University, Xi''an 710049,China;2. State Key Laboratory for Manufacturing Systems Engineering, Xi''an Jiaotong University, Xi''an 710054, China;1. Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;3. Shaanxi Province Key Laboratory of Thin Film Technology and Optical Test, Xi’an Technological University, Xi’an, Shaanxi 710032, China;1. Department of Construction and Manufacturing Engineering, University of Oviedo, Campus de Gijón, 33203, Gijón, Spain;2. Cybernetic Research Module, University of León, Campus de Vegazana, 24071, León, Spain;1. Graduate School at Shenzhen, Harbin Institute of Technology, Harbin 150001, PR China;2. Centre for Infrastructure Engineering, School of Computing, Engineering and Mathematics, Western Sydney University, Penrith, NSW 2751, Australia;1. School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;1. School of Mechanical Engineering & Mechanics, Ningbo University, Ningbo 315211, China;2. School of Mechatronics and Energy Engineering, NingboTech University, Ningbo 315100, China |
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| Abstract: | Optical linear encoder is generally adopted to realize the full-closed loop control for the linear motor feed system. Its reading head installed on the worktable may vibrate as a result of the excitation of disturbance harmonics, which leads to the encoder's error. This study aims to investigate the mechanism of displacement fluctuation due to the encoder's error caused by the worktable vibration in the linear motor feed system. The vibrating modes of feed system are analyzed firstly, and then the influences of three torsional vibrations on encoder's errors are investigated. The transfer function between disturbance and output response is proposed to analyze the influence of encoder's error on the displacement fluctuation. The relationships among vibration, encoder's error, thrust harmonic and displacement fluctuation are discussed in detail. The results show that the encoder's error can produce obvious displacement fluctuation for the linear motor feed system, which is actually an electromechanical coupling process due to the direct drive and full-closed loop control. Finally, three effective measures are put forward to diminish the system displacement fluctuation. |
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| Keywords: | Linear motor feed system Displacement fluctuation Vibration Encoder's error Electromechanical coupling |
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