Honpine

Harmonic Drive Precision Rotary Actuator Unit

The rotary actuator unit is a power unit specifically designed for precision machine tools, industrial automation, and semiconductor applications. It typically integrates an inner-rotor frameless torque motor with components such as a reducer and encoder to form a complete rotary actuator unit. The control unit (driver) usually adopts an external drive configuration to achieve high-precision motion control for connected equipment.


Harmonic Drive Servo Actuator offer flexible voltage compatibility, supporting both high-voltage AC220V and low-voltage DC48V power inputs. They are widely used in fields requiring high precision and compact spatial integration, such as:Precision machine tool rotary tables,High-accuracy medical devices,5-axis laser cutting systems,Semiconductor manufacturing equipment.
Based on technical design differences, rotary actuators are categorized into two main types:

Standard Harmonic Gear Rotary Actuators

Large Hollow Shaft Harmonic Drive Rotary Actuators

High Precision CNC Semiconductor Machinery Rotary Actuators

Servo Driven Rotary Actuators

Harmonic Drive Rotary Actuator Principle

A harmonic rotary actuator is an AC servo rotary actuator that integrates a high-torque precision harmonic reducer, a frameless torque motor, an optional hollow-shaft multi-turn absolute optical encoder, an electromagnetic brake, and a servo drive into one compact unit.

harmonic servo rotary actuator

What is a Harmonic Drive Actuator？

A harmonic drive actuator is a device that converts electrical energy into mechanical energy to achieve rotational motion of mechanical parts. Its core technologies include a motor, a harmonic reducer, and sensors. As the core component of a rotary actuator, the motor is responsible for converting electrical energy into mechanical energy to achieve the rotation of the mechanical parts; the reducer reduces the motor speed and increases torque to meet the needs of various application scenarios; and the sensors monitor the actuator's position and speed to achieve closed-loop control. Rotary actuators are widely used in various joints and drive components of humanoid robots, such as the head, neck, waist, arms, and legs. By using rotary actuators, humanoid robots can perform various complex movements such as walking, bending, grasping, and manipulating. In addition, rotary actuators can also be used in other automated equipment and intelligent devices, such as machine tools, automated production lines, and drones.

Advantages of Harmonic Drive Servo Actuator

Integrated Design

Integrates a high-torque precision harmonic reducer, frameless torque motor, multi-turn absolute encoder (optional hollow optical design), and electromagnetic brake into a compact unit. Compared with the conventional “harmonic drive + servo motor” setup, harmonic rotary actuators offer clear advantages in compactness, assembly efficiency, and overall system reliability.

 

Ease of Use

Features an optional hollow shaft design for convenient routing of cables, air lines, or laser beams, improving system integration flexibility. The actuator adopts long-life lubrication, eliminating the need for grease replacement or regular maintenance during operation, significantly reducing maintenance costs.

harmonic gear actuator

High Performance

Delivers high tilting rigidity, high torque output, and strong load capacity with smooth and stable operation. Each motor is individually tested before delivery to ensure low vibration and low noise performance. Combined with the precision of the harmonic reducer and motor stiffness, it achieves true zero-backlash transmission.

Low Maintenance

Designed for easy installation and compatibility with standard servo drives, enabling plug-and-play integration. It maintains positioning accuracy for over 15,000 hours at rated torque, ensuring long-term stable operation while minimizing maintenance and downtime.

Application of Harmonic Drive Strain Wave Reducer Rotary Actuator

 

Harmonic Drive Rotary Actuator integrates a high-precision harmonic reducer, encoder, and frameless torque motor. Compatible with mainstream external drives, it ensures stable performance and long-term accuracy. The large hollow shaft simplifies cable routing. Its modular design enables easy, low-cost maintenance, even after the reducer's service life. Rated IP65 (IP67 optional), it is fully sealed, easy to install, and ready to use. The 220V version suits CNC machine tools, 3C equipment, laser processing, and medical devices, while the 48V model fits robotic joints, AGVs, and PTZ cameras.

 

 

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  • precision rotary actuator for machine tools
  • Semiconductor equipment with harmonic actuator
  • robot with harmonic drive actuator
  • automation machine with harmonic rotary actuator
  • five-axis machining equipment with harmonic servo motor
  • CNC milling machine with harmonic servo actuator

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precision rotary actuator for machine tools

Harmonic AC Servo Rotary Actuator - FAQ

Compared to the harmonic DC joint motor, the harmonic AC servo rotary actuator has higher repeatability and rigidity, making it an industrial-grade harmonic actuator.

A：

Harmonic rotary actuators offer stable performance with a precision retention life of more than 15,000 hours.
With a direct-drive integrated design and a fully sealed structure, installation is simple and truly plug-and-play.
For applications with limited space, heavy loads, and high precision requirements, harmonic mechatronic actuators provide an ideal solution.

A：

Harmonic servo actuators are widely used in:
Machine tool rotary tables
Laser cutting systems
Electronics and semiconductor equipment
Precision CNC machine tools
3C (computer, communication, consumer electronics) equipment
Precision laser processing equipment
LED manufacturing equipment
Inspection and testing equipment
Medical devices
Robots and special robotic arms
Printing machinery and inkjet equipment
Glass processing equipment
Precision measuring instruments

A：

The actuator combines high overturning rigidity, high torque load capacity, and smooth operation, featuring zero backlash and low noise.
With a service life exceeding 15,000 hours, it is maintenance-free and does not require lubricant replacement.
The hollow shaft design allows easy routing of cables and pneumatic lines. It is compatible with standard servo drives and supports plug-and-play installation.

A：

Operating life: 15,000 hours
Operating temperature: −20 °C to +75 °C

A：

The harmonic rotary actuator is equipped with a 23-bit encoder compliant with the Tamagawa protocol.
The motor is designed to work with a 48 V servo drive. Customers may use their own Tamagawa-compatible encoders, or HONPINE can provide an external drive for added convenience.

A：

HONPINE operates two comprehensive test benches rated at 0–100 N·m and 100–1000 N·m, covering the full size range from 11 to 58.
High-precision power analyzers accurately measure current, torque, efficiency, and other parameters, automatically generating performance curves and torque-speed (T-n) curves.
This ensures all specifications are verified by actual output performance, not theoretical estimates. Additional equipment is used for accuracy and rigidity testing.

A：

To address common industry challenges, HONPINE has introduced the upgraded HAT-G series rotary actuator.
While conventional models may deform and rebound under load, the HAT-G series uses advanced proprietary control algorithms to achieve over three times higher rigidity. Under identical loading conditions, dial indicator deflection is almost negligible.
An optional high-precision encoder is available, enabling positioning accuracy of ≤5 arc-seconds.

A：

HONPINE uses high-precision power analyzers to accurately measure current, torque, efficiency, and other key parameters, automatically generating data curves and torque-speed (T-n) curves.
All performance data is validated through real output testing, supported by additional accuracy and rigidity measurement equipment, ensuring reliable and truthful specifications.

A：

HONPINE uses high-precision power analyzers to accurately measure current, torque, efficiency, and other key parameters, automatically generating data curves and torque-speed (T-n) curves.
All performance data is validated through real output testing, supported by additional accuracy and rigidity measurement equipment, ensuring reliable and truthful specifications.

A：

HONPINE operates two comprehensive test benches rated at 0–100 N·m and 100–1000 N·m, covering the full size range from 11 to 58.
High-precision power analyzers accurately measure current, torque, efficiency, and other parameters, automatically generating performance curves and torque-speed (T-n) curves.
This ensures all specifications are verified by actual output performance, not theoretical estimates. Additional equipment is used for accuracy and rigidity testing.

A：

The harmonic rotary actuator is equipped with a 23-bit encoder compliant with the Tamagawa protocol.
The motor is designed to work with a 48 V servo drive. Customers may use their own Tamagawa-compatible encoders, or HONPINE can provide an external drive for added convenience.

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