Optical Positioning Actuators

Linear actuators with high-fidelity positioning听capabilities are required for aligning large听optical payloads used in ground-based听telescopes and the testing of space-based听optical systems. 刘玥首次大战黑人has developed and听fielded high performance actuators that听meet the needs of these demanding听applications. High precision components,听including a fine pitch, preloaded roller screw,听high gear ratio/backlash-free harmonic drive, flexured or preloaded end-joints,听and high resolution encoders lead to exceptional positioning capability even听under high loads. These customizable actuators can be incorporated into a wide variety of architectures including gimbals, tripods, and hexapods.

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Features

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High load capacity
High stiffness
High resolution
High repeatability
High accuracy

Self-locking
Vacuum-compatible
Low heat dissipation
Long life

High Load Optical Positioning Actuators

The OPA series actuators are used for static positioning or slow tracking operation where minimum incremental step size, repeatability, and/or accuracy are critical. These precision actuators have high stiffness, handle heavy loads, and avoid backdriving making them ideally suited for the alignment of large optics. Outdoor, cleanroom, and vacuum-compatible versions are available. Customization of stroke length, end-joints, and other features is common to meet program-specific requirements.

Applications

Ground-based telescope mirror positioning
Testing of space-based telescopes and optical systems
Beam/laser pointing

Performance Characteristics

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Model	OPA-400	OPA-500
Stroke Length¹	28 mm	160 mm
Minimum Incremental Step Size	0.1 渭m	0.1 渭m
Repeatability (Unidirectional)	< 1 渭m	< 3 渭m
Repeatability (Bidirectional)	< 3 渭m	< 10 渭m
Accuracy	< 0.05% of Full Range	< 0.1% of Full Range
Max Speed	1.17 mm/s (0.5 mm/s Continuous)	1.17 mm/s (0.5 mm/s Continuous)
Axial Load Capacity	39.2 kN	39.2 kN
Stiffness (Excluding End-Joints)	217 N/渭m	277 N/渭m
Dimensions² (Excluding End-Joints)	230 mm D x 375 mm L	274 mm D x 480 mm L
Mass (Excluding End-Joints)	39 kg	43 kg
Motor Type	Brushless	Brushless
Gear Reduction	50:1 Harmonic Drive (Zero Backlash)	50:1 Harmonic Drive (Zero Backlash)
Screw Type	Recirculating Roller Screw w/Preloaded Nut	Recirculating Roller Screw w/Preloaded Nut
Sensor Type	Absolute Linear Encoder	Rotary Encoder
Backdrivable³	No (Self-Locking)	No (Self-Locking)
End-Joint Options	Flexures, Universal Joints w/ Preloaded Bearings, Custom	Flexures, Universal Joints w/ Preloaded Bearings, Custom
Vacuum Compatibility	With Customization	Yes
Heritage Usage	Rubin Observatory/Large Synoptic Survey Telescope (LSST)	James Webb Space Telescope Testing, NASA X-Ray and Cryogenic Facility (XRCF)

1. Custom stroke lengths available upon request

2. Length measured at midstroke position

3. Brakes available as additional protection against backdriving

Resources

Literature

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