Article

Contact-free moving-magnet type of micropositioner with optimized specification

LG-PRC, Kyunggi
IEEE Transactions on Magnetics (impact factor: 1.36). 06/2002; DOI:10.1109/20.999129 pp.1539 - 1548
Source: IEEE Xplore

ABSTRACT In this paper, we introduce a contact-free moving-magnet type of
positioner that uses magnetic levitation to eliminate friction, the
major limiting factor to high resolution on the micromanufacturing
level. The promising magnetic structure consists of permanent magnets
mounted on the stage and air-core solenoids, with little uncertainty,
fixed on the stator. Since magnetically levitated systems are inherently
unstable, the design concept focuses on stability. Combining the above
elements with the repulsive force property, we suggest a novel six
degrees-of-freedom Maglev positioner stabilized with minimum sensory
feedback in space and have formulated the dynamic equation of the system
by the linear perturbation technique. The chief design parameters are
optimized to maximize the stable boundary. We present test results to
verify the dynamic characteristics

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    Article: A multi-fingered micromechanism for coordinated micro/nano manipulation
    Sandeep Krishnan, Laxman Saggere
    [show abstract] [hide abstract]
    ABSTRACT: Coordinated manipulation of micro-scale objects is critical for advancing several emerging applications such as microassembly and manipulation of biological cells. Most of the existing designs for micromanipulators are designed to accomplish primarily spatial positioning functionalities using positioning stages. Relatively, there are very few micromanipulators capable of 'grip-and-place' functionality that comprises both gripping and positioning at micro-scales. However, such manipulators are generally bulky. This paper introduces a novel concept of a miniaturized micromanipulator with multiple fingers for coordinated planar manipulation that involves both gripping and positioning of micro-scale objects. In this micromanipulator, multiple independently actuated fingers coordinate with each other to accomplish the manipulation. The paper presents a systematic design of the micromanipulator through shape optimization of each finger for a rationally chosen topology and a proof-of-concept prototype of the device fabricated using conventional microfabrication processes. Experimental results characterizing the input–output behavior of a finger mechanism in the prototype device are presented and an excellent correlation between the experimental results and the theoretical results validating both the design and the fabrication of the micromanipulator prototype is demonstrated. Experiments involving coordinated manipulation of 15 µm diameter polystyrene microspheres using multiple fingers in the micromanipulator station are also presented.
    J. Micromech. Microeng. 01/2007; 17:576-585.
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Keywords

chief design parameters
 
Combining
 
contact-free moving-magnet type
 
degrees-of-freedom Maglev positioner
 
dynamic characteristics
 
dynamic equation
 
linear perturbation technique
 
magnetically levitated systems
 
permanent magnets
 
promising magnetic structure
 
repulsive force property
 
stator
 
unstable
 
uses magnetic levitation
 

Kwang Suk Jung