Aerotech’s ADR series direct-drive rotary stages provide
superior angular positioning and velocity control. Applications
range from high-speed laser machining to precision wafer inspection.
Superior Mechanical Design
Large diameter, matched-set ABEC-7 angular contact bearings are
used to maximize performance with respect to wobble, moment stiffness,
and rotating friction. A thick-walled, precision-ground shaft
further minimizes wobble. The large diameter bearings permit large
payloads without compromising performance.
Brushless Direct Drive
To maximize positioning performance, the ADR series utilizes Aerotech’s
S-series brushless, slotless motor. This motor has all the advantages
of a brushless direct-drive motor – no brushes to wear,
no gear trains to maintain, and high acceleration and high speeds.
Since it is a slotless, ironless design, there is zero cogging,
meaning that there is absolutely no torque ripple. This makes
the ADR ideal for applications requiring outstanding contoured
motion, smooth scan velocity, or precise incremental steps.
With its low inherent inertia and high power output, the ADR is
capable of speeds and accelerations that are an order of magnitude
greater than typical direct-drive devices or worm-driven stages.
The low inertia and zero backlash makes the ADR the ideal solution
for applications requiring frequent directional changes.
Accurate Positioning
A wide range of performance feedback grades is available. Typical
line counts range from 3600 to 36000 lines per revolution. When
coupled with Aerotech’s MX series resolution multipliers,
resolutions can be as fine as 0.036 arc sec.
The motor and high-performance rotary encoder are directly coupled
to a common shaft. The absence of gear trains and mechanical couplings
means no position errors caused by hysteresis, windup, or backlash.
As a result, absolute accuracies of ±1 arc sec are attainable.
Flexible Configurations
Options include large throurgh-hole apertures, over-travel limits,
and adjustable hardstops. Larger diameter stages with larger motors
are available, as are AZ-EL gimbal mounts (see AOM360D).
Aerotech manufactures a wide range of servo amplifiers and advanced
controllers to provide a complete integrated package.
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