High speed tracking control of ball screw drives

Chao-Yi Liu,Ruei-Yu Huang,An-Chen Lee

doi:10.1088/1757-899x/241/1/012030

Chao-Yi Liu, Ruei-Yu Huang + Show 1 more

Open Access

https://doi.org/10.1088/1757-899x/241/1/012030

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Abstract

This paper presents a new method to achieve the requirement of high speed and high precision for ball screw drive. First, a PI controller is adopted to increase the equivalent structural damping in the velocity loop. Next, the design of the position controller is implemented by a two-stage method. The Doubly Coprime Factorization Disturbance Observer (DCFDOB) is developed to suppress disturbance and resist modelling error in the inner loop, while the outer loop is then designed based on method to extend the system bandwidth over first resonant frequency so that high speed and high accuracy can be achieved. Finally, a feedforward controller is implemented to improve tracking performance. The experiment results showed that the proposed method has smaller tracking error and better performance for suppressing disturbance when compared to the conventional cascaded P-PI control.

Highlights

Owing to the multiple transmission, the structure of the ball screw system is elastic, which makes actual movement has few differences from input command. These errors will be magnified during fast motion
How to fulfill the demand of high speed and high precision is very important in motion control technology
To solve the above problems, this paper presents a new method to achieve the requirement of high speed and high precision for ball screw drive operating higher than the first resonant frequency

Summary

Introduction

Owing to the multiple transmission, the structure of the ball screw system is elastic, which makes actual movement has few differences from input command. These errors will be magnified during fast motion. S. Frey et al [3] proposed a discrete model to derive the relationship of the table position and the first resonant frequency. External disturbance and measuring noise are important factors in the motion control. To solve the above problems, this paper presents a new method to achieve the requirement of high speed and high precision for ball screw drive operating higher than the first resonant frequency

System Model

Cascade H Design Method

Method

Conclusion