AMG Gimbal

Description

Design Features

  • Continuous 360 degree rotation of azimuth and elevation including built-in slip ring
  • High accuracy angular position and rate capability
  • Direct-drive brushless servomotors result in zero backlash
  • Cog-free design for outstanding velocity stability
  • Accommodate loads up to 600 mm diameter
  • Low maintenance and high reliability provide the lowest cost of ownership

Aerotech's AMG position and rate gimbal mounts provide ultra-precise angular position, rate and acceleration for development and production testing of a wide range of systems. The AMG series is ideal for directing optics, lasers, antennas and sensors at high speed to very precise pointing angles. Typical applications include missile seeker test and calibration, LIDAR, electro-optical sensor and FLIR testing, airborne target tracking, optical testing of space-based sensors in a vacuum and angular testing of inertial sensors such as gyros, MEMS, accelerometers and inertial reference units. The AMG gimbal design incorporates recent Aerotech rotary stage design improvements to provide high performance at an affordable price. The finest quality motors, bearings and encoders are integrated into precision-machined housings to ensure peak performance. The AMG position and rate gimbals provide precise angular motion with the high performance customers expect from Aerotech products.

Accurate 360° Positioning and Rate Generation

Direct-drive brushless torque motors, with rare-earth magnets and high-accuracy angular transducers, are coupled directly to precision shafts for accurate and smooth 360° continuous motion. The absence of gear trains and other drive mechanisms eliminates position error contributions due to mechanical hysteresis and backlash. Directly-coupled high-resolution position transducers ensure highly accurate and repeatable positioning.

A wide-range of performance feedback grades is available. Typical line gimbal resolution ranges from 1.0 to 0.13 µrad with Aerotech controls. The built-in azimuth slip ring provides for continuous rotation with no cable wrap up.

Direct-Drive Motors for Outstanding Control

To maximize positioning and velocity performance, AMG gimbal mounts utilize Aerotech’s high torque S-series brushless, slotless servomotors. These motors have all of 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 results in smoother motion throughout travel and more precise positioning. These motors are available in different winding configurations to work with high or low voltage power supplies.

Superior Mechanical Design Features

Large diameter, matched-set ABEC-7 bearings maximize performance with respect to wobble, moment stiffness and rotating friction. The large diameter bearing permits large payload capacity without compromising performance. Casting gimbal yokes provide high stiffness to maintain gimbal accuracy under dynamic conditions. Travel limits, hardstops and brakes are available as standard options.

Mirror and Alternate Payload Accommodation

A variety of mirror cell diameters are available for standard optic applications. We also provide for custom payload attachment solutions to accommodate various device interfaces. Each gimbal mirror cell can be modified or replaced with different shaped cells to accommodate sensors or other odd shaped payloads. We understand customer payloads vary and our engineers have a variety of solutions to implement offset CG payloads.

Specifications

Specifications

ModelAMG-200AMG-300AMG-400AMG-500AMG-600
Travel 360° continuous, AZ/EL
Clear Aperture Diameter(1) 194 mm 292 mm 394 mm 489 mm 591 mm
Mechanical Drive System Direct-Drive Brushless Servomotor
Accuracy ±24 to ±144 µrad(2) (±5 to ±30 arc sec)
Repeatability ±2.4 µrad (±0.5 arc sec)
Maximum Rotary Speed(3) 100 rpm 100 rpm 100 rpm 50 rpm 50 rpm
AZ Resolution(4) 0.27 µrad 0.2 µrad 0.2 µrad 0.13 µrad 0.13 µrad
EL Resolution(4) 0.27 µrad 0.27 µrad 0.27 µrad 0.2 µrad 0.2 µrad
Maximum Load Capability 20 kg 40 kg 40 kg 70 kg 70 kg
Axis Wobble 48 µrad (10 arc sec)
Orthogonality 24 µrad (5 arc sec)
Standard Finish Black Anodize with Hard-Coated Cell
Max Component Diameter(5) 206 mm 306 mm 407 mm 509 mm 610 mm
Nominal Component Thickness 41 mm 54 mm 64 mm 95 mm 102 mm
Mass (Without Mirror) 29 kg 47 kg 54 kg 116 kg 137 kg
Inertia AZ(6) 0.521 kg-m2 1.198 kg-m2 2.246 kg-m2 8.289 kg-m2 12.362 kg-m2
Inertia EL(6) 0.016 kg-m2 0.103 kg-m2 0.265 kg-m2 0.950 kg-m2 2.310 kg-m2
AZ Motor Type S-130-39-A S-180-69-A S-180-69-A S-240-63-A S-240-63-A
EL Motor Type S-130-39-A S-130-39-A S-130-39-A S-180-69-A S-180-69-A
AZ Aperture When Slip Ring Is Removed (AZ Travel Must Be Limited) 50 mm 75 mm 75 mm 100 mm 100 mm
Aperture With Slip Ring 12.7 mm 12.7 mm 12.7 mm 38.1 mm 38.1 mm
  1. Special cell adapters and slip ring assemblies available by special order.
  2. ±24 μrad calibrated; ±144 μrad uncalibrated.
  3. Maximum speed based on stage capability; maximum application velocity may be limited by system data rate and system resolution.
  4. With x500 multiplication on AS encoder. Higher resolutions available.
  5. Tolerance equals +0/−0.25.
  6. Unloaded inertia.

Dimensions

  • AMG-200
  • AMG-300
  • AMG-400
  • AMG-500
  • AMG-600

Ordering Information

Ordering Example

AMG 200 AS (Opt.)/

Ordering Options

ModelCell SizePosition TransducerStage & Assembly Options
AMG -200
-300
-400
-500
-600
-AS
-X5
-X50
-VAC3
-VAC6

AMG Direct-Drive Motorized Gimbal

OptionsDescription
AMG-200 High accuracy, direct-drive gimbal with zero motion cogging and zero backlash; 206 mm mirror cell ID with mirror face forward of the rotation intersection of AZ/EL; fundamental encoder resolution: both AZ and EL 11840 lines/rev; continuous 360 degree rotation in both axes; includes AZ slip ring for the EL axis power and signals
AMG-300 High accuracy, direct-drive gimbal with zero motion cogging and zero backlash; 306 mm mirror cell ID with mirror face forward of the rotation intersection of AZ/EL; fundamental encoder resolution: AZ 15744 lines/rev, EL 11840 lines/rev; continuous 360 degree rotation in both axes; includes AZ slip ring for the EL axis power and signals
AMG-400 High accuracy, direct-drive gimbal with zero motion cogging and zero backlash; 407 mm mirror cell ID with mirror face forward of the rotation intersection of AZ/EL; fundamental encoder resolution: AZ 15744 lines/rev, EL 11840 lines/rev; continuous 360 degree rotation in both axes; includes AZ slip ring for the EL axis power and signals
AMG-500 High accuracy, direct-drive gimbal with zero motion cogging and zero backlash; 509 mm mirror cell ID with mirror face forward of the rotation intersection of AZ/EL; fundamental encoder resolution: AZ 23600 lines/rev, EL 15744 lines/rev; continuous 360 degree rotation in both axes; includes AZ slip ring for the EL axis power and signals
AMG-600 High accuracy, direct-drive gimbal with zero motion cogging and zero backlash; 610 mm mirror cell ID with mirror face forward of the rotation intersection of AZ/EL; fundamental encoder resolution: AZ 23600 lines/rev, EL 15744 lines/rev; continuous 360 degree rotation in both axes; includes AZ slip ring for the EL axis power and signals

Position Transducer (AZ = azimuth; EL = elevation)

AMG-200

OptionsDescription
-AS Standard feedback device; 1 Vpp sine wave output encoder with 0.27 μrad resolution in both AZ and EL when used with 2000 times external multiplication
-X5 TTL output encoder with internal 5x multiplier provides 27 μrad resolution in both AZ and EL
-X50 TTL output encoder with internal 50x multiplier provides 2.7 μrad resolution in both AZ and EL

AMG-300/400

OptionsDescription
-AS Standard feedback device; 1 Vpp sine wave output encoder with 0.2 μrad resolution in AZ and 0.27 μrad resolution in EL when used with 2000 times external multiplication
-X5 TTL output encoder with internal 5x multiplier provides 20 μrad resolution in AZ and 27 μrad resolution in EL
-X50 TTL output encoder with internal 50x multiplier provides 2 μrad resolution in AZ and 2.7 μrad resolution in EL

AMG-500/600

OptionsDescription
-AS Standard feedback device; 1 Vpp sine wave output encoder with 0.13 μrad resolution in AZ and 0.2 μrad resolution in EL when used with 2000 times external multiplication
-X5 TTL output encoder with internal 5x multiplier provides 13 μrad resolution in AZ and 20 μrad resolution in EL
-X50 TTL output encoder with internal 50x multiplier provides 1.3 μrad resolution in AZ and 2.0 μrad resolution in EL

Stage Construction Options

OptionsDescription
/VAC3 Vacuum preparation of stage to 10-3 torr
/VAC6 Vacuum preparation of stage to 10-6 torr

Contact Factory for Custom Options Available

Optional mirror face aligned to rotation axes — the mirror cell may be offset so the mirror face is at the AZ/EL intersection as a special order system; additional counterbalance weight may be needed for this configuration; please consult factory for details.

External cable CMS; larger clear aperture available through AZ; limited AZ travel

Limit switches and hard stops available

Slip ring for customer signals and power