DocumentCode :
1052566
Title :
Novel Electromagnetic Actuation Scheme for Multiaxis Nanopositioning
Author :
Verma, Shalini ; Shakir, H. ; Kim, Woo-Ju
Volume :
42
Issue :
8
fYear :
2006
Firstpage :
2052
Lastpage :
2062
Abstract :
In this paper, we present a novel electromagnetic actuation scheme for nanoscale positioning with a six-axis magnetic-levitation (Maglev) stage, whose position resolution is 3 nm over an extended travel range of 5 ,\\times, 5 mm in the x - y plane. We describe the conceptualization of the actuation scheme, calculation of forces, and their experimental verification in detail. This actuation scheme enables the application of forces in two perpendicular directions on a moving permanent magnet using two stationary current-carrying coils. The magnetic flux generated by the magnet is shared by the two coils, one right below and another on one side of the magnet. The magnitudes and directions of the currents in the coils govern the forces acting on the magnet, following the Lorentz-force law. We analyzed and calculated the electromagnetic forces on the moving magnet over a large travel range. We used feedback linearization to eliminate the force-gap nonlinearity in actuation. The new actuation scheme makes the Maglev stage very simple to manufacture and assemble. Also, there is no mechanical constraint on the single moving platen to remove it from the assembly. There are only three NdFeB magnets used to generate the actuation forces in all six axes. This reduces the moving-part mass significantly, which leads to less power consumption and heat generation in the entire Maglev stage. We present experimental results to demonstrate the payload and precision-positioning capabilities of the Maglev nanopositioner under abruptly and continuously varying loads. The potential applications of this Maglev nanopositioner include microfabrication and assembly, semiconductor manufacturing, nanoscale profiling, and nanoindentation.
Keywords :
Electromagnetic analysis; feedback linearization; multiaxis nanopositioning; permanent-magnet actuator; precision motion control; Assembly; Coils; Electromagnetic analysis; Electromagnetic forces; Force feedback; Magnetic analysis; Magnetic flux; Magnetic levitation; Nanopositioning; Permanent magnets; Electromagnetic analysis; feedback linearization; multiaxis nanopositioning; permanent-magnet actuator; precision motion control;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2006.875839
Filename :
1661949
Link To Document :
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