Direct-drive rotary stages are IP66 rated
18 June 2010
The Aerotech ASRT series rotary stage features direct drive brushless servomotor technology for precise zero backlash positioning applications requiring an IP66 seal. The unit is available in three nominal widths of 185mm, 245mm and 300mm in a dual bearing design that can support axial loads of up to 175kg whilst maintaining a tilt error motion of less than 3 arc-sec.
A low friction seal between the fixed base and rotating tabletop minimises hysteresis due to direction reversal to allow precise angular positioning and high speed performance. A bi-directional repeatability of less than 1 arc-sec is specified for the optical encoder feedback version, whilst a magnetic encoder version available on the smaller stages offers less than 10 arc-sec. The use of non contacting motor and encoder technologies helps contribute to a long life with low maintenance.
Both standard and HALAR certified accuracy options are available for best accuracy to within 2 arc-sec for the optical encoder version, with a positioning resolution of 0.018 arc-sec for the largest 300mm width stage. Thanks to its direct-drive brushless and cog-free motor technology, the stage offers this precision at speeds of up to 200 rpm and acceleration in the order of 150rpm/rpm. This is combined with extremely smooth low-speed motion and excellent position stability. Users can specify continuous travel or a fixed travel range under 360 degrees rotation.
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