Comprehensive Guide to the HONPINE HAG Harmonic Drive Robotic Actuator Unit with Torque Sensor

This article provides a comprehensive overview of the HONPINE HAG harmonic drive robotic actuator unit with torque sensor, including its functions, advantages, disadvantages, and application value.

What Is a Harmonic Drive Robotic Actuator Unit with Torque Sensor?

A standard harmonic drive robotic actuator unit typically integrates:Harmonic drive gearbox,Frameless torque motor,Brake,Encoder,Drive unit

The HONPINE HAG harmonic drive robotic actuator further integrates a built-in torque sensor on top of the standard configuration, enabling high-precision force sensing and advanced force-control capabilities.

What Functions Does a Harmonic Drive Robotic Actuator Unit with Torque Sensor Provide?

Real-Time Output Torque Detection

The actuator directly measures the actual joint output torque instead of estimating torque through motor current calculation. This provides:

• Higher measurement accuracy

• Faster response speed

• Real-time reflection of load, external force, and contact force

• High-Precision Compliant Force Control

The integrated torque sensor supports:

• Impedance control

• Compliance control

• Zero-force drag teaching

• Gravity compensation

When the robot encounters obstacles or external contact, the actuator can yield flexibly instead of pushing rigidly against the object. This makes it highly suitable for humanoid robots and collaborative robots.

• Collision Detection and Safety Protection

• The system continuously monitors sudden torque changes and can quickly detect:

• Collisions

• Interference

• Jamming

• Overload conditions

Combined with STO (Safe Torque Off), speed reduction, or reverse retreat functions, the actuator forms a dual-layer safety protection system that compensates for the limitations of pure position control.

Load Monitoring and Overload Protection

The actuator continuously monitors:

• Rated torque

• Peak torque

• Impact loads

• This helps protect:

• Harmonic drive gearbox

• Bearings

• Motor

Transmission structure

while reducing the risk of gear tooth breakage, deformation, and mechanical damage caused by long-term overload or impact loads.

High-Precision Torque Closed-Loop Control

The actuator is ideal for applications requiring constant force output, including:

• Precision assembly

• Connector insertion and extraction

• Polishing

• Surface fitting

Instead of relying solely on rigid position control, the system uses force as the closed-loop control target, significantly improving operation accuracy and production yield.

Advantages of Harmonic Drive Robotic Actuator Units with Torque Sensor

Native Force Control with High Response Speed

By directly measuring joint output torque, the actuator supports millisecond-level impedance control and force control for highly responsive and compliant interaction.

Compact and Lightweight Structure

The integrated torque sensor design does not increase axial length, improving payload-to-weight ratio and making it suitable for the compact space requirements of humanoid robots.

High Rigidity and Better Dynamic Performance

Since the torque sensor is embedded internally, there is no additional rigidity loss or increased rotational inertia caused by external sensors, resulting in superior dynamic performance.

Integrated Safety and Force-Control Solution

The actuator integrates:

• Drive

• Transmission

• Sensing

• Control

• Safety functions

into a single compact module, simplifying overall robot design and shortening development cycles.

Collaborative Safety and Compliant Interaction

STO ensures collision safety, while the torque sensor enables compliant contact and force-control operation, making the actuator highly suitable for collaborative robots and humanoid robots.

Optimized Space and Weight Efficiency

By eliminating external force sensors and separate safety modules, the actuator achieves:

• Minimal axial dimensions

• Lower overall weight

• Improved motion efficiency

• Better battery endurance

Disadvantages of Harmonic Drive Robotic Actuator Units with Torque Sensor

Significantly Higher Cost

High-precision strain gauges and signal conditioning circuits increase manufacturing costs, while calibration equipment is also expensive.

Complex Manufacturing Process

The integrated structure requires extremely high assembly precision, resulting in longer production cycles for mass manufacturing.

Difficult Maintenance

If the torque sensor fails, the harmonic drive gearbox or motor may need to be disassembled, leading to longer maintenance cycles and higher repair costs.

Higher Overall System Cost

The combination of STO and integrated torque sensing increases module cost, limiting adoption in low-end or cost-sensitive applications.

Higher Maintenance and After-Sales Costs

Fault diagnosis is more complicated and often requires specialized equipment and technical expertise, increasing after-sales service costs.

Contact us to obtain the latest technical documentation and product information for the HONPINE HAG harmonic drive robotic actuator unit.