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Linear Stage Uses Direct-Coupled Brushless Motor For High Servo Bandwidth And Smooth Velocity |
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Oct 08, 2004 at 08:00 PM |
 Product Briefing Outline: The ATS125 is Aerotech's
smallest hardcover, side-sealed linear stage. The integral brushless
motor reduces the overall footprint of the stage enabling its
deployment in space-constrained applications, while the hardcover
provides protection from debris created in the manufacturing process.
Problem: The ATS125 with integral motor option directly couples
a brushless motor to the ball-screw drive. This eliminates the flexible
coupling typically present in screw-driven stages, yielding a stiffer
system with higher servo bandwidth. The lack of a coupling also
improves system reliability by removing a component susceptible to
failure. The robust aluminum cover is hard-coated for scratch
resistance, and the side seals keep dirt and particulates out of the
stage and protect the bearing surfaces from contamination. The vertical
orientation of the seals easily deflects debris away from the stage.
Top seal designs can collect debris, resulting in the eventual failure
and replacement of the sealing mechanism.
Solution: The integral motor is enclosed in a modular
subassembly that, if required, can be easily replaced in the field. The
motor is based on a slotless design that provides ultra-smooth velocity
operation due to the complete absence of torque ripple. Standard- and
precision-grade ball-screw options are available to closely match the
price/performance point of a wide variety of positioning applications.
Square-wave encoder output with a net resolution of 1 micron for 10 mm
ball screw and 0.5 micron for 5 mm ball screw is standard with the
integral motor. An optional analog output encoder can be coupled with
external interpolation electronics to provide higher resolution. The
stage is also available specially prepared for vacuum operation. A
holding brake can be added to the integral motor modular assembly for
vertical applications.
Applications: Space-constrained applications.
Platform: Travels up to 600 mm. Speeds up to 600 mm/s.
Availability: 2004 onwards.
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Product Briefings 
