Design and Development of Small Aerostatic Electromagnetic Linear Actuator with High Precision and Research on its Performance
Date Issued
2007
Date
2007
Author(s)
Wu, Cha-Lin
DOI
zh-TW
Abstract
The paper presents a novel design of a small aerostatic guided electromagnetic linear actuator, which is integrated with the electromagnetic solenoids and aerostatic bearings. The aerostatic bearing levitates the actuating rod with four radial air inlets on each side. The frictionless aerostatic guide can improve the actuating rod is electromagnetically driven by a fixed solenoid and a actuating solenoid. Through adjusting the axial position of the actuating solenoid, the actuating stroke can be fine regulated. The both solenoids create opposing magnetic forces, and their balancing condition can be controlled by the current regulation of the actuating solenoid. By means of the force balance controlling the electromagnetic actuator realizes the precision positioning. The aerostatic bearing integrates the surface restrictors with the ceramic journal bearings toe build up the radial supporting air film around the actuating rod for accurate guiding. The aerostatic levitation can effectively reduce the driving power for the actuating rod and avoid the stick-slip effect during the sliding process. The low driving power can also decrease the thermal induced positioning error, and the air flow can enhance the cooling efficiency for perserving long-time operational accuracy. By applying the finite element analyses and the experiments, the magnetic conditions insides the solenoids, the actuating force and the actuating displacement and studied.
Subjects
電磁致動器
電磁線圈
氣靜壓軸承
低摩擦驅動
electromagnetic linear actuator
solenoid
aerostatic
low friction driving
Type
thesis
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