Φ20mm Micro Joint Actuator

Product Introduction

For applications where installation space is limited but reliable rotary motion and high torque output are required, Φ20mm Micro Joint Actuator provides a compact integrated motion solution. The X20 flagship module measures only Φ20mm × 20mm and weighs approximately 37.2–41.6 g, making it suitable for highly space-constrained mechanical structures.

The module uses an axial flux motor architecture to achieve more than 30% higher torque density than conventional motor designs while maintaining an ultra-compact footprint. Combined with a miniature reduction mechanism and absolute magnetic encoder, the actuator is designed for precise motion control, rapid response and efficient power transmission.

As part of the micro-drive solutions developed by Suzhou Vaxor-motor CO.,LTD., the X20 series is intended for robotics, medical devices, precision instruments and intelligent equipment requiring compact, high-performance actuation.

Key Product Advantages

Ultra-Compact Φ20mm × 20mm Design

The X20 actuator measures only Φ20mm × 20mm, allowing designers to integrate powered joints into compact robotic mechanisms, miniature motion assemblies and other applications where conventional actuators may occupy excessive space.

High Torque Density

The axial flux motor architecture provides more than 30% higher torque density than conventional motor designs. This helps achieve greater torque output without significantly increasing the overall actuator footprint.

High Torque Output

Depending on the selected configuration, continuous torque can reach up to 450 mNm, while initial torque can reach up to 800 mNm. The available torque range allows the module to support different compact motion requirements.

Multiple Gear Ratio Options

The X20S/L-UM15/30/50-MH-4 configuration supports gear ratios of 15, 30 and 50, allowing system designers to balance output torque, rotational speed and mechanical requirements according to the application.

Absolute Magnetic Encoder

An integrated absolute magnetic encoder provides position feedback for closed-loop motion control. This configuration is suitable for applications requiring accurate joint positioning and repeatable movement.

Lightweight Construction

With a weight of approximately 37.2–41.6 g, the actuator helps reduce the moving mass of robotic joints and miniature mechanisms, supporting compact structural designs and responsive motion.

Technical Specifications

Compact Motion Architecture

The X20 combines an axial flux motor with miniature reduction technology to create a high-power-density actuation module. The compact architecture integrates motor drive elements and mechanical reduction within a small cylindrical footprint, helping simplify motion-system integration.

The design can be used where actuator diameter, weight and available installation space are important design constraints. Its compact form factor is particularly relevant to multi-axis mechanisms in which several actuators must be installed within a limited structural envelope.

Precise Position Feedback

The built-in absolute magnetic encoder provides position information for control systems through SPI communication. Absolute position feedback can support accurate joint control and repeatable movement without relying solely on external position-sensing components.

This configuration can be integrated into robotic control architectures where compact dimensions, feedback capability and communication efficiency are required.

Voltage and Gear Ratio Selection

The X20 configuration supports 12 V, 24 V and 48 V operating options. Different voltage selections can be matched to the electrical architecture and power requirements of the target equipment.

Three gear ratio options—15, 30 and 50—provide flexibility for different output requirements. Higher reduction ratios can be considered when increased output torque is prioritized, while lower ratios may be selected when greater output speed is required.

Actual system selection should consider the required load, duty cycle, operating speed, available power supply and mechanical transmission conditions.

Applications

The compact actuator architecture is suitable for a range of micro-motion and precision equipment applications, including:

• Compact robotic joints

• Miniature robotic arms

• Humanoid and service robotics

• Precision motion mechanisms

• Medical equipment

• Precision instruments

• Intelligent equipment

• Miniature automation systems

• Compact electromechanical assemblies

• Research and development prototypes

For robotic applications, the low weight and small diameter can help engineers design lightweight multi-joint mechanisms. For precision instruments and medical equipment, the compact architecture can help accommodate powered motion where installation space is restricted.

Robotics Integration

The small form factor of Φ20mm Micro Joint Actuator makes it suitable for robotic systems requiring multiple distributed actuators. A diameter of only 20 mm allows the actuator to be considered for compact joint structures, while the high torque density helps maintain useful output within a limited mechanical envelope.

The absolute magnetic encoder and SPI communication interface also support integration with digital motion-control systems. Engineers can configure the actuator according to the required joint torque, speed, voltage and control architecture.

Product Selection Considerations

When selecting an X20 configuration, buyers and engineers should evaluate:

• Required continuous and peak torque

• Desired output speed

• Gear ratio

• System supply voltage

• Available installation diameter and length

• Total moving mass

• Encoder feedback requirements

• Controller communication interface

• Duty cycle and operating conditions

• Mechanical connection requirements

Selecting the appropriate gear ratio and voltage combination can help balance torque, speed, power consumption and overall system performance.

Engineering and Customization Capability

Suzhou Vaxor-motor CO.,LTD. focuses on micro-drive technologies combining axial flux motors, PCB/FPCB winding, optimized electromagnetic design and miniature reduction mechanisms.

Its multidisciplinary engineering team covers motor design, precision manufacturing, structural design, robotics control and intelligent manufacturing. The development process is supported from prototype validation and pilot production through batch delivery, helping customers move compact motor concepts toward practical equipment integration.

The company develops micro joint actuators and ultra-micro coreless motors for robotics, medical devices, precision instruments and intelligent equipment, with an emphasis on compact dimensions, high performance and scalable production.

B2B Supply and Cooperation

The X20 micro joint actuator is suitable for OEM projects, robotic equipment development, precision motion systems and engineering prototypes requiring miniature high-torque actuation.

Customers can select different voltage and gear ratio configurations according to application requirements. Technical discussions can focus on torque, speed, installation space, encoder feedback, communication and mechanical integration before production.

For robotics and intelligent equipment manufacturers, the module can serve as a compact motion component for developing lightweight and space-efficient joint structures.

Product Summary

Φ20mm Micro Joint Actuator X20 combines a Φ20mm × 20mm footprint, axial flux motor architecture, up to 450 mNm continuous torque, absolute magnetic encoder and SPI communication for compact precision motion applications. Developed by Suzhou Vaxor-motor CO.,LTD., it provides a lightweight micro-drive option for robotics, medical devices, precision instruments and intelligent equipment.