scholarly journals 2D Positioning Control System for the Planar Motion of a Nanopositioning Platform

2019 ◽  
Vol 9 (22) ◽  
pp. 4860 ◽  
Author(s):  
Lucía Díaz-Pérez ◽  
Marta Torralba ◽  
José Antonio Albajez ◽  
José Antonio Yagüe-Fabra
Keyword(s):  
Control System ◽  
Laser System ◽  
Linear Motor ◽  
Planar Motion ◽  
Two Dimensional ◽  
Positioning Control ◽  
Linear Motors ◽  
Generic Solution ◽  
Custom Made ◽  
Planar Movement

A novel nanopositioning platform (referred as NanoPla) in development has been designed to achieve nanometre resolution in a large working range of 50 mm × 50 mm. Two-dimensional (2D) movement is performed by four custom-made Halbach linear motors, and a 2D laser system provides positioning feedback, while the moving part of the platform is levitating and unguided. For control hardware, this work proposes the use of a commercial generic solution, in contrast to other systems where the control hardware and software are specifically designed for that purpose. In a previous paper based on this research, the control system of one linear motor implemented in selected commercial hardware was presented. In this study, the developed control system is extended to the four motors of the nanopositioning platform to generate 2D planar movement in the whole working range of the nanopositioning platform. In addition, the positioning uncertainty of the control system is assessed. The obtained results satisfy the working requirements of the NanoPla, achieving a positioning uncertainty of ±0.5 µm along the whole working range.

scholarly journals One-Dimensional Control System for a Linear Motor of a Two-Dimensional Nanopositioning Stage Using Commercial Control Hardware

Micromachines ◽  
2018 ◽  
Vol 9 (9) ◽  
pp. 421 ◽  
Author(s):  
Lucía Díaz Pérez ◽  
Marta Torralba Gracia ◽  
José Albajez García ◽  
José Yagüe Fabra
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Dynamic Properties ◽  
Linear Motor ◽  
Two Dimensional ◽  
Precision Engineering ◽  
Loop Control ◽  
One Dimensional ◽  
Linear Motors ◽  
Custom Made

A two-dimensional (2D) nanopositioning platform stage (NanoPla) is in development at the University of Zaragoza. To provide a long travel range, the actuators of the NanoPla are four Halbach linear motors. These motors present many advantages in precision engineering, and they are custom made for this application. In this work, a one-dimensional (1D) control strategy for positioning a Halbach linear motor has been developed, implemented, and experimentally validated. The chosen control hardware is a commercial Digital Motor Control (DMC) Kit from Texas Instruments that has been designed to control the torque or the rotational speed of rotative motors. Using a commercial control hardware facilitates the applicability of the developed control system. Nevertheless, it constrains the design, which needs to be adapted to the hardware and optimized. Firstly, a dynamic characterization of the linear motor has been performed. By leveraging the dynamic properties of the motor, a sensorless controller is proposed. Then, a closed-loop control strategy is developed. Finally, this control strategy is implemented in the control hardware. It was verified that the control system achieves the working requirements of the NanoPla. It is able to work in a range of 50 mm and perform a minimum incremental motion of 1 μm.

Improvement in a Surface Motor-Driven Planar Motion Stage

2006 ◽  
Vol 18 (6) ◽  
pp. 808-815 ◽  
Author(s):  
Wei Gao ◽  
◽  
Katsutoshi Horie ◽  
Songyi Dian ◽  
Kei Katakura ◽  
...  
Keyword(s):  
Measurement Errors ◽  
Planar Motion ◽  
Two Dimensional ◽  
Positioning Accuracy ◽  
Accuracy Measurement ◽  
Linear Motors ◽  
Stator Windings ◽  
Motion Stage ◽  
Planar Motion Stage ◽  
Sinusoidal Surface

We report a surface motor-driven planar motion stage with an XYθZsurface encoder. The surface motor consists of two pairs of linear motors. Magnetic arrays are installed on the platen and stator windings of linear motors on the stage base. The platen is moved in the X and Y directions by X and Y linear motors. It is rotated around the Z axis by moment generated by the X or Y linear motors. The surface encoder consists of two two-dimensional (2D) angle sensors and an angle grid with 2D sinusoidal surface waves. The angle grid is installed on the platen. Sensors onside make the stage compact. The surface encoder is improved for higher positioning accuracy. Measurement errors of the surface encoder using two detectors – a quadrant PD and 2D PSD – are determined by simulation. The surface motor for increasing stage speed is modified. We conducted experiments comparing the previous prototype stage (Prototype I) and the improved stage (Prototype II).

Application of Fuzzy PI control to improve the positioning accuracy of a rotary-linear motor driven by two-dimensional ultrasonic actuators

2000 ◽  
Vol 24 (2) ◽  
pp. 105-112 ◽  
Author(s):  
M Kinouchi ◽  
I Hayashi ◽  
N Iwatsuki ◽  
K Morikawa ◽  
J Shibata ◽  
...  
Keyword(s):  
Linear Motor ◽  
Pi Control ◽  
Two Dimensional ◽  
Positioning Accuracy

Reliability Analysis of Redundant Dynamic Positioning Control System With Human Factor Involved

2016 ◽  
Author(s):  
Fang Wang ◽  
Yong Bai ◽  
Feng Xu
Keyword(s):  
Control System ◽  
Markov Process ◽  
Reliability Analysis ◽  
Oil And Gas ◽  
Dynamic Positioning ◽  
Positioning Control ◽  
Safety And Reliability ◽  
Long Time ◽  
Component Failure Rates ◽  
Technical Failures

Deepwater oil and gas explorations bring more safety and reliability problems for the dynamically positioned vessels. With the demands for the safety of vessel crew and onboard device increasing, the single control architecture of dynamic positioning (DP) system can not guarantee the long-time faultless operation for deeper waters, which calls for much more reliable control architectures, such as the Class 2 and Class 3 system, which can tolerate a single failure of system according to International Maritime Organization’s (IMO) DP classification. The reliability analysis of the main control station of DP Class 3 system is proposed from a general technical prospective. The fault transitions of the triple-redundant DP control system are modeled by Markov process. The effects of variation in component failure rates on the system reliability are investigated. Considering the DP operation involved a human-machine system, the DP operator factors are taken into account, and the human operation error failures together with technical failures are incorporated to the Markov process to predict the reliability of the DP control system.

Active-Synchronization Control System Used in DC Linear Motor

1981 ◽  
Vol PER-1 (11) ◽  
pp. 21-22
Author(s):  
Takashi Umemori ◽  
Koichi Matsuoka ◽  
Kazumi Matsui ◽  
Takao Otsubo
Keyword(s):  
Control System ◽  
Linear Motor ◽  
Synchronization Control

Design of an Observer-Based Repetitive Control System to Reject Periodic Disturbance

2016 ◽  
Vol 25 (06) ◽  
pp. 1650061 ◽  
Author(s):  
Zhen Shao ◽  
Zhengrong Xiang
Keyword(s):  
Control System ◽  
Disturbance Rejection ◽  
Lyapunov Functional ◽  
Repetitive Control ◽  
Sufficient Condition ◽  
Two Dimensional ◽  
Periodic Disturbance ◽  
Repetitive Learning ◽  
The Stability ◽  
2D Model

This paper concerns the design of an observer-based repetitive control system (RCS) to improve the periodic disturbance rejection performance. The periodic disturbance is estimated by a repetitive learning based estimator (RLE) and rejected by incorporation of the estimation into a repetitive control (RC) input. Firstly, the configuration of the observer-based RCS with the RLE is described. Then, a continuous–discrete two-dimensional (2D) model is built to describe the RCS. By choosing an appropriate Lyapunov functional, a sufficient condition is proposed to guarantee the stability of the RCS. Finally, a numerical example is given to verify the effectiveness of the proposed method.

scholarly journals Adaptive positioning control of an ultrasonic linear motor system

2017 ◽  
Vol 44 ◽  
pp. 156-173 ◽  
Author(s):  
Jia-Si Mo ◽  
Zhi-Cheng Qiu ◽  
Jun-Yang Wei ◽  
Xian-Min Zhang
Keyword(s):  
Motor System ◽  
Linear Motor ◽  
Positioning Control
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