Humanoid Robot Joint Module Selection Guide: Choosing the Right Harmonic Joint Module for Every Robot Joint

Selecting the right joint module is one of the most important decisions in humanoid robot design.

Different robot joints require different levels of torque, speed, stiffness, and payload capacity. Using the same actuator throughout the robot often increases weight, reduces efficiency, and limits motion performance.

The Honpine HPJM-PRO Series Harmonic Joint Modules provide a complete range of integrated joint actuators for humanoid robots, enabling engineers to optimize every joint from the head to the lower body.

Each module integrates:

• Harmonic drive reducer

• Frameless torque motor

• Safety brake

• Dual absolute encoders

• Integrated servo drive

Supporting EtherCAT and CANopen, the HPJM-PRO Series delivers positioning repeatability of ±10 arcsec and covers rated torque from 1.8 N·m to 363 N·m.

Why Humanoid Robots Require Different Joint Modules？

Unlike traditional industrial robots, humanoid robots perform highly dynamic movements while maintaining balance.

Each body section has different mechanical requirements.

For example:

• Head joints prioritize lightweight and fast response.

• Arm joints require a balance between payload and flexibility.

• Waist joints support upper-body posture adjustments.

• Lower-body joints demand high torque and structural rigidity.

Selecting the appropriate harmonic joint module for each location significantly improves overall robot performance.

Recommended Joint Modules for Different Robot Body Parts

Head Joint Module

Recommended Model

HPJM-RE30-40-PRO-XX

Ideal for:

• Neck pitch

• Neck yaw

• Head rotation

Specifications

• Rated torque: 1.8–2.8 N·m

• Weight: approximately 0.18 kg

• 6 mm hollow shaft

• High-speed response

Benefits

• Lower moving inertia

• Faster interaction

• Better cable management

Shoulder Joint Module

Recommended Model

HPJM-RE60-70-PRO-XX

Rated torque

19.8–30 N·m

Applications

• Shoulder pitch

• Shoulder roll

• Main load-bearing joint

Benefits

• Large motion range

• High payload capacity

• Stable arm movement

Upper Arm and Forearm Joint Modules

Recommended Models

• HPJM-RE40-52-PRO-XX

• HPJM-RE50-60-PRO-XX

Rated torque

5–18 N·m

Applications

• Elbow joints

• Upper arm

• Forearm

Benefits

• Balanced torque output

• Lightweight structure

• Improved arm efficiency

Wrist Joint Module

Recommended Model

HPJM-RE30-40-PRO-XX

Applications

• Wrist rotation

• Dexterous hands

• End effectors

Benefits

• Compact design

• High positioning accuracy

• Reduced end-effector weight

Waist Joint Module

Recommended Models

• HPJM-RE70-80-PRO-XX

• HPJM-RE70-90-PRO-XX

Rated torque

32–50 N·m

Applications

• Waist rotation

• Body pitch

• Upper-body posture control

Benefits

• Strong structural support

• Smooth body movement

• Improved balance

Lower Body Joint Module

Recommended Model

HPJM-RE100-120-PRO-XX

Rated torque

94–169 N·m

Applications

• Hip joint

• Base connection

• Lower-body support

Base Pitch Joint Module

Recommended Model

HPJM-RE110-145-PRO-XX

Rated torque

169–363 N·m

Applications

• Base pitch

• Heavy-duty body support

• High-load humanoid robots

Benefits

• Maximum torque

• High rigidity

• Stable locomotion

Recommended Joint Configuration Table

Why Choose Honpine HPJM-PRO Joint Modules?

Compared with conventional actuator solutions, the HPJM-PRO Series offers:

• Integrated harmonic drive reducer

• Frameless torque motor

• Dual absolute encoders

• Safety brake

• Integrated servo drive

• EtherCAT & CANopen communication

• Modular architecture for easier integration

• Wide torque range from 1.8 N·m to 363 N·m

Typical Applications

The HPJM-PRO Series is suitable for:

• Humanoid robots

• Service robots

• Research robots

• Educational robots

• Reception robots

• Healthcare robots

• Hospitality robots

• Industrial collaborative robots

About Honpine HPJM-PRO Series

The Honpine HPJM-PRO Series includes seven frame sizes from RE30 to RE110, covering rated torque from 1.8 N·m to 363 N·m.

Optional configurations include:

• Torque sensor integration

• Wide-temperature operation (-40°C)

• Custom output flange

• Communication protocol customization

Whether your robot is designed for research, commercial service, or industrial applications, the HPJM-PRO Series provides a scalable and reliable integrated joint solution.

Request a Sample or Contact Honpine

Looking for the right humanoid robot joint module for your next project?

Contact the Honpine team to discuss your application or request a sample of the HPJM-PRO Series.