Ultra-Precision Direct-Drive Air Bearing Rotary Stage

Ultra-Precision Direct-Drive Air Bearing Rotary Stage

Ultra-precision air bearing rotary stage with direct-drive motion, sub-arcsecond positioning, and nanometer-level runout for semiconductor, optical metrology, and precision measurement applications.

Product Overview

The Ultra-Precision Air Bearing Rotary Stage is designed for high-accuracy angular positioning, smooth rotation, and demanding precision measurement applications.

It integrates a hydrostatic air bearing, frameless direct-drive torque motor, high-resolution rotary encoder, and precision-machined rotary platform to deliver frictionless motion, high stiffness, low vibration, and exceptional rotational accuracy.

With sub-arcsecond positioning and nanometer-level radial and axial runout available on selected models, the rotary stage provides a reliable motion platform for semiconductor inspection, optical metrology, laser diffraction, precision calibration, and advanced manufacturing.

Working Principle

Pressurized air forms a stable air film between the rotating and stationary bearing surfaces, creating a non-contact support system. This eliminates mechanical friction and wear while maintaining smooth and highly stable rotation.

The direct-drive torque motor rotates the platform without gears or belts, while the high-resolution optical encoder provides real-time angular feedback for closed-loop positioning and velocity control.

Air Bearing + Direct Drive + High-Resolution Encoder = Ultra-Precision Rotary Motion

Core Performance

The precision air bearing rotary stage is engineered for applications where conventional mechanical bearings cannot provide the required motion performance.

Typical performance characteristics may include:

*Performance varies according to rotary stage model, bearing configuration, encoder, control system, and operating conditions. Please contact us for model-specific specifications.

Core Advantages

Frictionless Air Bearing

Non-contact operation minimizes friction, wear, vibration, and maintenance while providing clean, oil-free motion.

Sub-Arcsecond Positioning

High-resolution encoder feedback and precision control enable highly accurate angular positioning and repeatability.

Nanometer-Level Runout

Precision air bearing technology supports extremely low axial and radial runout for demanding metrology and optical applications.

High Stiffness & Load Capacity

The rigid air bearing structure provides high resistance to external loads and deformation, supporting precision manufacturing and heavy-duty configurations.

Direct-Drive Performance

The frameless torque motor eliminates mechanical transmission components, reducing backlash and transmission error while improving response and low-speed stability.

Low Vibration & Low Noise

Frictionless rotation and direct-drive motion provide smooth, stable operation for sensitive optical and measurement systems.

Low-Profile Design Options

Compact configurations are available for equipment requiring reduced overall height and efficient integration.

Key Applications

Semiconductor & Wafer Inspection

• Wafer inspection

• Semiconductor metrology

• Wafer alignment

• Chip measurement

• Precision wafer processing

Optical Metrology

• Optical component inspection

• Lens and mirror alignment

• Laser measurement

• Optical calibration

• Precision optical assembly

Precision Measurement & Calibration

• Angular calibration

• Rotary encoder calibration

• Angle standard measurement

• Precision metrology systems

Advanced Manufacturing

• Ultra-precision machining

• Precision grinding

• Micro-machining

• Automated inspection

• High-accuracy assembly

Scientific & Aerospace Applications

• Laboratory research

• Optical experiments

• Sensor calibration

• Aerospace testing

• Precision simulation systems

Technical Parameters

Why Choose a Precision Air Bearing Rotary Stage?

For applications requiring a combination of ultra-high angular accuracy, low runout, high stiffness, high load capacity, low vibration, and long-term operational stability, an air bearing rotary stage provides an advanced alternative to conventional mechanical bearing solutions.

The combination of:

Hydrostatic Air Bearing + Direct-Drive Torque Motor + High-Resolution Rotary Encoder + Precision Rotary Platform + Closed-Loop Motion Control

creates a complete ultra-precision angular positioning system for demanding industrial and scientific applications.

Whether used as a precision air bearing rotary table for semiconductor inspection, a high-accuracy rotary stage for optical metrology, or an angular positioning platform for calibration and scientific research, the system can be customized according to required diameter, load capacity, angular accuracy, speed, encoder resolution, mounting interface, and environmental conditions.

Frequently Asked Questions (FAQ)

What is a precision air bearing rotary stage?

A precision air bearing rotary stage is an ultra-precision rotary positioning platform that uses a pressurized air film to support the rotating assembly without mechanical contact. It is designed for applications requiring high angular accuracy, low runout, low vibration, and high rotational stability.

What is the advantage of an air bearing over a mechanical bearing?

An air bearing eliminates conventional mechanical contact between bearing surfaces, resulting in extremely low friction, minimal wear, low vibration, and clean, oil-free operation. It is particularly suitable for ultra-precision motion and metrology applications.

What industries use air bearing rotary stages?

Air bearing rotary stages are widely used in semiconductor manufacturing, wafer inspection, optical metrology, precision measurement, laser diffraction, scientific research, aerospace testing, precision machining, and medical imaging equipment.

How accurate is an air bearing rotary stage?

Depending on the model and configuration, an air bearing rotary stage can provide sub-arcsecond angular positioning and nanometer-level axial or radial runout. Exact performance depends on the bearing design, encoder, structural configuration, control system, and operating conditions.

Can an air bearing rotary stage support heavy loads?

Yes. Air bearing rotary stages can be engineered for different load requirements, from laboratory-scale precision instruments to heavy-duty industrial systems. The required load capacity should be matched with the bearing diameter, structural design, air pressure, stiffness, and application conditions.

Does an air bearing rotary stage require lubrication?

No conventional oil lubrication is required for the air bearing itself. The air bearing uses pressurized air to create the supporting film, providing a clean and low-maintenance operating environment.