ALAR-SP Large Aperture Rotary Stages
Description
Design Features
- Ideal balance of load capability, torque output, and profile height, with clear aperture diameters up to 325 mm
- Direct-drive torque motor delivers extremely precise, smooth, cog-free rotation
- High axial-, radial-, and moment-load capacities support large payloads and gimbal configurations
- Long service life and consistent performance over time
- Engineered for easy integration into multi-axis systems and machines
Advantage: ALAR
ALAR-SP offers numerous advantages over worm-drive stages. Because ALAR stages use direct-drive torque motors, they are free from backlash, vibration, and excessive wear commonly associated with gear-driven stages, and they are also capable of much higher speeds and accelerations. These advantages translate to higher system accuracy, repeatability, and longevity, as well as greater throughput. Users can more precisely manufacture, inspect, or process more parts in less time, leading to lower operating costs and higher profits.Brushless, Slotless Direct-Drive Motors
Aerotech’s brushless, direct-drive motors are featured in all ALAR stages. Because there are neither brushes to wear, nor gear trains or couplings to maintain, ALAR stages are capable of high speeds and accelerations, plus consistent, stable performance over time with zero backlash, windup, or hysteresis. Further, ALAR motors are both slotless and ironless, thereby eliminating cogging and torque ripple to deliver exceptionally smooth motion. ALAR stages are ideal for applications requiring outstanding contoured motion, smooth scan velocities, and precise, incremental steps.High Payload Capacity and Moment-Load Stiffness
Large-diameter angular contact bearings provide high axial-, radial-, and moment-load capacities, maximizing positioning performance with respect to tilt error, stiffness, and rotating friction. ALAR-SP is capable of achieving the highest performance standards regardless of whether the axis of rotation is vertical or horizontal. Due to its ample moment-load capability, ALAR-SP is especially well-suited to carry cantilevered or offset payloads, when the center of gravity is shifted away from the axis of rotation.Flexible Configurations for Simplified Integration
ALAR-SP is offered with features and options that facilitate easy integration into multi-axis motion systems and subsystems. It is available with a range of clear-aperture diameters from 100 mm to 325 mm, and also a variety of feedback options including analog 1 Vpp, digital RS422, and absolute encoders. Continuous 360-degree travel is standard, with available limited-travel options ranging from 10 degrees to 340 degrees. ALAR250SP and ALAR325SP can be configured with an even more powerful motor option for increased torque to more effectively rotate high-inertia payloads. ALAR-SP stages can even be adapted for use in vacuum environments.Applications
Common applications for ALAR-SP stages include single- and multi-axis sensor testing, missile seeker testing, antenna testing, inertial navigation device testing, photonic component alignment, high-accuracy laser machining, and precision wafer inspection. ALAR-SP stages can also be configured as multi-axis gimbals. The large-diameter clear aperture and direct-drive motor make ALAR a better-performing alternative to more traditional worm-gear stages, especially in dynamic applications with high payloads.Specifications
ALAR-SP Specifications
Mechanical Specifications |
ALAR100SP |
ALAR150SP |
ALAR200SP |
Travel |
Continuous (optional 340° max. limited travel) |
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Aperture |
100 mm |
150 mm |
200 mm |
0.1 µrad (0.02 arc sec) |
0.08 µrad (0.016 arc sec) |
0.06 µrad (0.012 arc sec) |
|
± 9.7 µrad (± 2 arcsec) |
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Bidirectional Repeatability |
± 2.4 µrad (± 0.5 arc sec) |
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Tilt-Error Motion |
9.7 µrad (2.0 arc sec) |
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300 rpm |
250 rpm |
90 rpm |
|
Maximum Acceleration |
1364 rad/s2 |
1330 rad/s2 |
361 rad/s2 |
Maximum Torque |
23.9 N•m |
42.9 N•m |
126.8 N•m |
Continuous Torque |
6.0 N•m |
10.7 N•m |
19.3 N•m |
Axial Load |
1550 N |
1950 N |
4675 N |
Radial Load |
1350 N |
1925 N |
4775 N |
Moment Load |
250 N•m |
450 N•m |
1600 N•m |
Shaft Inertia |
0.022 kg•m2 |
0.040 kg•m2 |
0.320 kg•m2 |
Shaft Inertia with Limits |
0.026 kg•m2 |
0.051 kg•m2 |
0.359 kg•m2 |
Stage Mass |
16.3 kg |
18.6 kg |
40.4 kg |
Stage Mass with Limits |
17 kg |
19.6 kg |
43.1 kg |
Mechanical Specifications |
ALAR250SP-M1 |
ALAR250SP-M2 |
ALAR325SP-M1 |
ALAR325SP-M2 |
Travel |
Continuous (optional 340° max. limited travel) |
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Aperture |
250 mm |
325 mm |
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0.05 µrad (0.01 arc sec) |
0.04 µrad (0.009 arc sec) |
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± 9.7 µrad (± 2 arcsec) |
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Bidirectional Repeatability |
± 2.4 µrad (± 0.5 arc sec) |
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Tilt-Error Motion |
9.7 µrad (2.0 arc sec) |
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140 rpm |
150 rpm |
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Maximum Acceleration |
287 rad/s2 |
185 rad/s2 |
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Maximum Torque |
137.8 N•m |
206.7 N•m |
213.8 N•m |
320.8 N•m |
Continuous Torque |
21.0 N•m |
31.5 N•m |
35.0 N•m |
52.4 N•m |
Axial Load |
4950 N |
5825 N |
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Radial Load |
5200 N |
6650 N |
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Moment Load |
1825 N•m |
2650 N•m |
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Shaft Inertia |
0.500 kg•m2 |
1.010 kg•m2 |
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Shaft Inertia with Limits |
0.573 kg•m2 |
1.2 kg•m2 |
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Stage Mass |
51.3 kg |
61.2 kg |
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Stage Mass with Limits |
54.5kg |
64.9 kg |
- Resolution assumes -AS encoder with 2000x controller multiplication.
- Certified with each stage. Requires the use of an Aerotech controller.
- Square-wave digital encoder options will limit maximum speed below the listed value. Contact factory for specific stage and encoder speed combination.
Electrical Specifications
Electrical Specifications |
ALAR100SP |
ALAR150SP |
ALAR200SP |
|
Motor |
Brushless Slotless |
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Continuous Current |
Apk |
2.7 |
6.2 |
5.3 |
Arms |
1.9 |
4.4 |
3.8 |
|
Peak Current, Stall |
Apk |
10.8 |
24.8 |
34.8 |
Arms |
7.6 |
17.5 |
24.6 |
|
Bus Voltage |
Up to 340 VDC |
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Incremental Encoder Line Count |
31,488 lines/rev |
40,000 lines/rev |
55,040 lines/rev |
|
5 V, normally closed |
Electrical Specifications |
ALAR250SP-M1 |
ALAR250SP-M2 |
ALAR325SP-M1 |
ALAR325SP-M2 |
|
Motor |
Brushless Slotless |
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Continuous Current |
Apk |
5.3 |
8.0 |
5.1 |
7.7 |
Arms |
3.8 |
5.6 |
3.6 |
5.4 |
|
Peak Current, Stall |
Apk |
34.8 |
52.2 |
31.2 |
46.8 |
Arms |
24.6 |
36.9 |
22.1 |
33.1 |
|
Bus Voltage |
Up to 340 VDC |
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Incremental Encoder Line Count |
64,800 lines/rev |
76,800 lines/rev |
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5 V, normally closed |
- Limited travel options only.

Dimensions
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ALAR100SP Enlarge Image
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ALAR150SP Enlarge Image
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ALAR200SP Enlarge Image
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ALAR250SP Enlarge Image
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ALAR325SP Enlarge Image
Ordering Information
ALAR-SP Large-Aperature Rotary Stage
Option | Description |
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ALAR100SP | Mechanical-bearing, direct-drive rotary stage, 100 mm aperture |
ALAR150SP | Mechanical-bearing, direct-drive rotary stage, 150 mm aperture |
ALAR200SP | Mechanical-bearing, direct-drive rotary stage, 200 mm aperture |
ALAR250SP | Mechanical-bearing, direct-drive rotary stage, 250 mm aperture |
ALAR325SP | Mechanical-bearing, direct-drive rotary stage, 325 mm aperture |
Motor (Required)
Option | Description |
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-M1 | Standard motor |
-M2 | High-power motor |
- Motor options (-M1 and -M2) only apply to the ALAR250SP and ALAR325SP stages.
Travel (Required)
Option | Description |
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Continuous travel (standard) | |
-TR010 | Limited travel, ±5 degrees |
-TR020 | Limited travel, ±10 degrees |
-TR030 | Limited travel, ±15 degrees |
-TR060 | Limited travel, ±30 degrees |
-TR090 | Limited travel, ±45 degrees |
-TR120 | Limited travel, ±60 degrees |
-TR180 | Limited travel, ±90 degrees |
-TR240 | Limited travel, ±120 degrees |
-TR300 | Limited travel, ±150 degrees |
-TR340 | Limited travel, ±170 degrees |
Feedback (Required)
Option | Description |
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-E1 | Incremental encoder, 1 Vpp |
-E2 | Incremental encoder, digital RS422, x4 interpolation |
-E3 | Incremental encoder, digital RS422, x20 interpolation |
-E4 | Incremental encoder, digital RS422, x40 interpolation |
-E5 | Incremental encoder, digital RS422, x100 interpolation |
-E6 | Incremental encoder, digital RS422, x200 interpolation |
-E7 | Absolute encoder |
Integration (Required)
Aerotech offers both standard and custom integration services to help you get your system fully operational as quickly as possible. The following standard integration options are available for this system. Please consult Aerotech if you are unsure what level of integration is required, or if you desire custom integration support with your system.
Option | Description |
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-TAS | Integration - Test as system Testing, integration, and documentation of a group of components as a complete system that will be used together (ex: drive, controller, and stage). This includes parameter file generation, system tuning, and documentation of the system configuration. |
-TAC | Integration - Test as components Testing and integration of individual items as discrete components that ship together. This is typically used for spare parts, replacement parts, or items that will not be used together. These components may or may not be part of a larger system. |