scholarly journals Micro feed characteristic analysis of a new crawler guide rail dual drive servo system

2021 ◽  
Vol 104 (3) ◽  
pp. 003685042110313
Author(s):  
Hanwen Yu ◽  
Zhenzhong Zhang ◽  
Jifei Xing
Keyword(s):  
Servo System ◽  
Drive System ◽  
Parameter Method ◽  
Feed Speed ◽  
Nonlinear Friction ◽  
Variable Speed ◽  
Guide Rail ◽  
Characteristic Analysis ◽  
Feed System ◽  
Low Speed

This paper presents a new type of crawler guide rail dual drive micro feed servo system based on “crawler type” guide rail. Through the innovative design of the crawler guide rail and the change of the working mode, the table, and the crawler type movable rail are relatively static, and the influence of nonlinear friction in low-speed micro feed is eliminated, so that the system can have a lower stable speed limit and realize accurate micro feed control. The Euler-Bernoulli beam element with axial and torsional degrees of freedom is used to describe the axial and torsional vibrations of the ball screw, and the lumped parameter method is used to analyze other parts of the feed system, and the electromechanical coupling dynamic model considering the nonlinear friction is established. The transfer function block diagram is used to characterize the motion relationship of the crawler guide rail dual drive servo feed system. The response difference between the screw single drive system and the new crawler guide rail dual drive system is analyzed by simulation when feeding at constant or variable speed, and the influence of different feed speed on the dynamic performance of the system. The results show that the low speed micro feed performance of the new crawler guide rail dual drive servo system is obviously better than that of the screw single drive system under the condition of constant speed or variable speed.

Dynamic characteristics analysis and experimental of differential dual drive servo feed system

2021 ◽  
pp. 095440622110179
Author(s):  
Hanwen Yu ◽  
Laigang Zhang ◽  
Chong Wang ◽  
Xianying Feng
Keyword(s):  
Degrees Of Freedom ◽  
Electromechanical Coupling ◽  
Simulation Analysis ◽  
Drive System ◽  
Ball Screw ◽  
Parameter Method ◽  
Feed Speed ◽  
Feed System ◽  
Stick Slip ◽  
Low Speed

This paper presents the design for a new differential-dual-drive low-speed micro-feed mechanism. The ‘nut rotary ball screw pair’ is the main driving component of the mechanism. The screw and nut are each driven by a servo motor and these motors rotate in the same direction at a similar speed. The nonlinear factors such as friction and backlash can lead to unstable behaviours such as stick-slip and oscillation of the feed system. We use the Euler–Bernoulli beam elements, which have axial and torsional degrees of freedom, to describe the axial and torsional vibration of the ball screw, and use the spring-lumped parameter method to analyse other components of the feed system. An electromechanical coupling dynamic model with nonlinear factors of friction and clearance is established. Through simulation analysis and experiment, the difference in response of single-drive and differential-dual-drive systems under the influence of friction and clearance is studied. The results show that the nonlinear factors of friction and clearance have an influence on the feed speed of single-drive and differential-dual-drive system, but the low-speed micro-feed performance of the differential-dual-drive system is evidently better than that of the single-drive system. In the experiment, under the condition of screw single drive and differential dual drive, the critical crawling velocities of the table are measured. The experimental results are consistent with the simulation results, which verifies that the established models are reasonable. This lays a foundation for the design and research of the controller.

scholarly journals Design and implementation of speed fluctuation reduction for a ball screw feed system at low-speed operation

2020 ◽  
Vol 11 (1) ◽  
pp. 163-172
Author(s):  
Zhaoguo Wang ◽  
Xianying Feng ◽  
Fuxin Du ◽  
Hui Li ◽  
Zhe Su
Keyword(s):  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Servo System ◽  
Ball Screw ◽  
Motor Speed ◽  
Feed System ◽  
Low Velocity ◽  
Motor Torque ◽  
Low Speed ◽  
Speed Fluctuation

Abstract. In the high-precision servo feed system, when the permanent magnet synchronous motor (PMSM) is operated at low speed in the classical drive feed system (CDFS), the speed fluctuation caused by the motor torque harmonics seriously affects the speed smoothness of the servo system. In this paper, a novel double-drive differential feed system (DDFS) is proposed to effectively suppress the effect of torque harmonics of PMSM on speed fluctuation of the linear feed system at low-speed operation. Firstly, the effect of motor torque harmonics on motor speed for the DDFS is analyzed by the sensitivity function of the servo system, which indicates that the torque harmonics have little effect on the motor speed at high-speed operation. Then, in the DDFS, we make two motors rotate in the same direction at high speed and differentially synthesize at the ball screw to obtain low-velocity linear motion. Compared with the CDFS, the DDFS can suppress the effect of motor torque harmonics on speed fluctuation of the table and improve speed smoothness at low-speed operation.

scholarly journals Dynamic modeling and analysis of the nut-direct drive system

2018 ◽  
Vol 10 (11) ◽  
pp. 168781401881065
Author(s):  
Zhaoguo Wang ◽  
Xianying Feng ◽  
Peigang Li ◽  
Fuxin Du
Keyword(s):  
Dynamic Models ◽  
Drive System ◽  
Parameter Method ◽  
Position Tracking ◽  
Servo Motor ◽  
Direct Drive ◽  
Tracking Accuracy ◽  
Feed System ◽  
Lumped Parameter ◽  
Lumped Parameter Method

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.

Energy Comparisons of the Adaptive Tracking Control for a Linear Drive System

2015 ◽  
Vol 764-765 ◽  
pp. 602-606 ◽  
Author(s):  
Kun Yung Chen ◽  
Rong Fong Fung
Keyword(s):  
Tracking Control ◽  
External Disturbance ◽  
Hamiltonian Function ◽  
Electrical Energy ◽  
Drive System ◽  
Nonlinear Friction ◽  
Adaptive Tracking Control ◽  
Adaptive Tracking ◽  
Tracking Controller ◽  
Linear Drive System

In this paper, a mechatronic motor-table system is realized to plan the minimum input electrical energy trajectory (MIEET) based on Hamiltonian function. In this system, the adaptive tracking controller is designed to track the MIEET to overcome the nonlinear friction and external disturbance. Moreover, trapezoidal trajectory (TT) and regulator control are compared with the MIEET by the adaptive tracking controller. Finally, it is concluded that the MIEET based on the adaptive tracking controller can obtain the minimum input electrical energy and robustness performance for the mechatronic motor table system.

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