Hollow Rotary Actuators: Precision Motion Solutions for Industrial Automation

Core Features & Advantages

1. Integrated Hollow Structure

• Central through-hole (Ø50-500mm typical) for cable/pneumatic routing

• Eliminates external cable carriers, reducing maintenance by 40%

1. High-Precision Motion

• Crossed-roller bearings: ≤30 arc-sec repeatability

• Helical gear/harmonic drive options: backlash as low as ≤1 arc-min

1. Compact Direct Drive Design

• Motor-integrated models achieve torque density to 300 Nm/kg

• Eliminates coupling alignment issues

Technical Specifications

Key Applications

1. Robotic Welding Positioners

• 360° continuous rotation with cable-through design

• Handles payloads to 1,200 kg

1. Semiconductor Handling

• Cleanroom-compatible versions (ISO Class 3)

• Vibration-damped models for wafer transfer

1. Automated Inspection Systems

• Integrated optical encoder feedback

• Direct mounting for vision cameras

1. Packaging Machinery

• High-cycle models (>5 million rotations)

• Corrosion-resistant coatings for food grade

Selection Guide

1. Load Requirements

• Calculate moment loads (static/dynamic)

• Include safety factor ≥1.5 for impact loads

1. Motion Profile

• Acceleration/deceleration torque demands

• Duty cycle considerations

1. Environmental Factors

• IP rating needs

• Temperature range (-20°C to 80°C standard)

1. Interface Options

• Servo motor flange types (Keyway, ISO, etc.)

• Custom mounting plate configurations

Maintenance & Service Life

• Lubrication Interval: 10,000 hours (grease)

• Bearing Life: L10 rating of 30,000 hours

• Diagnostic Features:

• Built-in temperature sensors

• Vibration monitoring ports

  FAQ
  

• Q1: What are the key differences between hollow rotary actuators and traditional rotary tables?

• A: Hollow rotary actuators offer:

• Integrated hollow design for cable/pneumatic routing (no external cable chains)

• Higher rigidity due to cross-roller bearings (vs. traditional ball bearings)

• Direct-drive options for zero-backlash and higher torque density

• Compact footprint, saving space in automation cells

• Traditional rotary tables typically require external motor coupling and cable management, increasing complexity.

  
  

• Q2: Can I customize the hollow bore size and mounting interface?

• A: Yes, most manufacturers offer:

• Bore sizes: From Ø50mm to Ø500mm+ (larger sizes reduce load capacity)

• Mounting flanges: ISO, NEMA, or custom motor interfaces

• Special coatings: Food-grade, corrosion-resistant, or vacuum-compatible options

  
  

• Q3: How do I maintain a hollow rotary actuator for long service life?

• A: Key maintenance practices:

• Lubrication: Regrease every 10,000 hours (or per OEM recommendation)

• Seal inspection: Check IP-rated seals annually (critical in dusty/wet environments)

• Vibration monitoring: Use built-in sensors to detect early bearing wear

• Avoid overloading: Sudden impacts can damage internal gears/bearings