ANT-20G Goniometers

Description

Design Features

  • Noncontact, non-cogging, frictionless direct-drive for zero backlash or hysteresis
  • High speed (150 degrees/s)
  • High resolution (0.05 arc sec)
  • Excellent in-position stability
  • Large 20 degree rotation angle
  • Orthogonal mounting of two cradles provides rotation about the same point
  • No maintenance
  • Compact design

Aerotech's ANT-20G goniometers represent a significant breakthrough in the high-accuracy angular alignment of components. This unique design utilizes Aerotech's best-in-class direct-drive noncontact motor technology. When used with Aerotech's controllers, the ANT-20G series provides an industry-leading positioning speed of 150 degrees per second.

High-precision bearings, direct on-axis encoder feedback and noncontact and noncogging direct-drive technology ensure the highest level of performance and make excellent repeatability and in-position stability a reality. The goniometer cradles can be mounted orthogonally to provide pitch and roll about the same point in space. Combining this with a rotary stage under the orthogonal assembly adds a third rotation axis (pitch, roll, yaw) through the same point.

The critical elements of the ANT-20G goniometers, as with all other ANT series nanopositioners, were selected to operate in a 24/7 manufacturing environment. Unlike worm- or piezo-driven goniometers, the ANT-20G series will not require periodic adjustment or maintenance. This will ensure many years of trouble-free operation. The ANT-20G cradles are available in four sizes.

Specifications

Mechanical Specifications

ModelANT-20G-50ANT-20G-90
Rotation Angle 20° 20°
Accuracy(1) ±90 µrad (±18 arc sec) ±50 µrad (±10 arc sec)
Resolution 0.25 µrad (0.05 arc sec) 0.25 µrad (0.05 arc sec)
Bidirectional Repeatability(1) ±18 µrad (±4 arc sec) ±10 µrad (±2 arc sec)
Unidirectional Repeatability ±5 µrad (±1 arc sec) ±5 µrad (±1 arc sec)
Tilt Error Motion ±90 µrad (±18 arc sec) ±50 µrad (±10 arc sec)
Maximum Speed 150 degrees per second
Maximum Acceleration 1200 rad/s2 500 rad/s2
Settling Time See graph for typical performance
In-Position Stability(2) ±0.4 µrad (±0.08 arc sec) ±0.2 µrad (±0.04 arc sec)
Nominal Radius of Rotation 50 mm 90 mm
Height from Tabletop to Rotation Point 19.1 mm 57.5 mm
Maximum Torque (Continuous) 0.40 N-m 0.85 N-m
Load Capacity Axial 1.5 kg 2.0 kg
Moment 60 kg-mm 80 kg-mm
Stage Mass 0.55 kg 1.1 kg
Material Aluminum
MTBF (Mean Time Between Failure) 30,000 Hours
  1. Certified with each stage.
  2. In-Position Jitter listing is 3 sigma value.
  3. Specifications are per axis, measured at the rotation point. Performance of multi-axis systems is payload and workpoint dependent. Consult factory for multi-axis or non-standard applications.

Mechanical Specifications

ModelANT-20G-110ANT-20G-160
Rotation Angle 20° 20°
Accuracy(1) ±40 µrad (±8 arc sec) ±30 µrad (±6 arc sec)
Resolution 0.25 µrad (0.05 arc sec) 0.25 µrad (0.05 arc sec)
Bidirectional Repeatability(1) ±10 µrad (±2 arc sec) ±10 µrad (±2 arc sec)
Unidirectional Repeatability ±5 µrad (±1 arc sec) ±5 µrad (±1 arc sec)
Tilt Error Motion ±40 µrad (±8 arc sec) ±30 µrad (±6 arc sec)
Maximum Speed 150 degrees per second
Maximum Acceleration 375 rad/s2 250 rad/s2
Settling Time See graph for typical performance
In-Position Stability(2) ±0.2 µrad (±0.04 arc sec) ±0.15 µrad (±0.03 arc sec)
Nominal Radius of Rotation 110 mm 160 mm
Height from Tabletop to Rotation Point 76.2 mm 120.4 mm
Maximum Torque (Continuous) 1.00 N-m 2.40 N-m
Load Capacity Axial 2.0 kg 3.5 kg
Moment 80 kg-mm 140 kg-mm
Stage Mass 1.2 kg 1.6 kg
Material Aluminum
MTBF (Mean Time Between Failure) 30,000 Hours
  1. Certified with each stage.
  2. In-Position Jitter listing is 3 sigma value.
  3. Specifications are per axis, measured at the rotation point. Performance of multi-axis systems is payload and workpoint dependent. Consult factory for multi-axis or non-standard applications.

Electrical Specifications

Drive System Slotless, Brushless, Direct Drive
Feedback Noncontact Encoder
Maximum Bus Voltage ±40 VDC
Limit Switches 5 V, Normally Closed
Home Switch Near Center

Recommended Controller

Multi-Axis A3200 Npaq MXR
Npaq MR-MXH
Ndrive ML-MXH
Ensemble Epaq MXH
Epaq MR-MXH
Ensemble ML-MXH
Single Axis Soloist Soloist ML-MXH
  1. Linear amplifiers are required to achieve the listed specifications. Other options are available.
  • ANT-20G-90 Step Plot
  • ANT-200-Spec-Image-2

Dimensions

  • ANT-20G-50
  • ANT-20G-90
  • ANT-20G-50-90
  • ANT-20G-110
  • ANT-20G-160
  • ANT-20G-110-160

Ordering Information

ANT-20G Series

Option Description
ANT-20G-50 20 degree travel goniometer with proprietary direct-drive motor technology, 50 mm radius of rotation, limits, 1 Vpp sinusoidal encoder, 1 meter cable, 25 D connector
ANT-20G-90 20 degree travel goniometer with proprietary direct-drive motor technology, 90 mm radius of rotation, limits, 1 Vpp sinusoidal encoder, 1 meter cable, 25 D connector
ANT-20G-110 20 degree travel goniometer with proprietary direct-drive motor technology, 110 mm radius of rotation, limits, 1 Vpp sinusoidal encoder, 1 meter cable, 25 D connector
ANT-20G-160 20 degree travel goniometer with proprietary direct-drive motor technology, 160 mm radius of rotation, limits, 1 Vpp sinusoidal encoder, 1 meter cable, 25 D connector