Φ20mm Micro Joint Actuator

Product Introduction

The Φ20mm Micro Joint Actuator is an ultra-compact motion module designed for robotic joints and precision motion applications where installation space, torque density, and control accuracy are critical. With an overall size of only Φ20mm × 20mm, the flagship X20 series integrates an axial-flux motor architecture with a miniature reduction mechanism to deliver high torque output within an extremely small footprint.

Compared with conventional motor designs, its innovative axial-flux architecture provides over 30% higher torque density, helping equipment manufacturers achieve more powerful joint performance without increasing actuator size. Supporting multiple voltage and gear ratio configurations, the actuator offers flexible integration options for different robotic structures and intelligent devices.

The X20 Φ20mm Micro Joint Actuator combines compact mechanical design, high torque density, absolute magnetic encoder feedback, and SPI communication. It is suitable for applications requiring precise positioning, responsive motion, and lightweight drive systems.

Key Product Features and Advantages

1. Ultra-Compact Φ20mm Design

With dimensions of just Φ20mm × 20mm, the X20 actuator is engineered for space-constrained applications. Its miniature structure makes it suitable for compact robotic joints, lightweight mechanisms, and precision equipment where conventional drive systems may be difficult to integrate.

2. High Torque Density Axial-Flux Motor

The innovative axial-flux motor architecture delivers over 30% higher torque density than conventional designs. This enables stronger output performance within a compact installation space, supporting the development of smaller and more capable robotic systems.

3. High Torque Output

The actuator provides continuous torque of up to 450 mNm and initial torque of up to 800 mNm. These output characteristics support robotic joint movements and precision mechanical operations requiring high torque relative to actuator size.

4. Multiple Gear Ratio Options

Available gear ratios include 15:1, 30:1, and 50:1, allowing equipment designers to select a suitable transmission configuration according to output torque and motion requirements.

5. Absolute Magnetic Encoder

Equipped with an absolute magnetic encoder, the actuator provides position feedback for motion control systems. This supports accurate positioning and integration into robotic joint control architectures.

6. SPI Communication Interface

The SPI communication interface supports data exchange with compatible control systems, facilitating integration into embedded motion control applications and intelligent robotic devices.

7. Multiple Voltage Options

The actuator supports 12V, 24V, and 48V configurations, offering flexibility for different power supply architectures and equipment designs.

8. Lightweight Construction

With a weight ranging from 37.2 g to 41.6 g, the X20 helps reduce the mass of moving components. Its lightweight design is particularly useful for compact robotic joints and applications where weight reduction contributes to overall system performance.

Product Specifications

Note: Maximum torque values and weight may vary depending on the selected configuration. Please confirm the corresponding model specifications before ordering.

Model and Configuration Options

The X20 series provides different configuration options to accommodate varying robotic joint requirements.

• Voltage Selection: 12V, 24V, or 48V.

• Gear Ratio Selection: 15:1, 30:1, or 50:1.

• Model Configuration: X20S/L-UM15/30/50-MH-4.

• Feedback System: Absolute magnetic encoder.

• Communication: SPI interface.

When selecting a configuration, engineers should consider the required output torque, motion characteristics, power supply, mechanical installation space, and controller compatibility.

Typical Applications

The Φ20mm Micro Joint Actuator is designed for compact drive systems across robotics, precision equipment, and intelligent machinery.

Robotics and Robotic Joints

Suitable for compact robotic joint assemblies where limited installation space and high torque density are important. Its miniature dimensions support the development of lightweight robotic structures and integrated motion systems.

Humanoid Robotics

The combination of compact size, torque output, and position feedback makes the actuator a potential drive solution for miniature humanoid robot joints and other space-constrained robotic mechanisms.

Medical Devices

Can be considered for compact medical equipment and precision mechanisms requiring controlled movement and miniature drive components, subject to application-specific safety and performance validation.

Precision Instruments

Suitable for integration into precision instruments and automated mechanisms where compact dimensions and accurate motion control are required.

Intelligent Equipment

Supports the development of compact intelligent terminals, automated devices, and miniature electromechanical systems requiring integrated motion solutions.

Technical Integration and Selection Considerations

For successful integration, equipment designers should evaluate the actuator according to the complete mechanical and electrical system requirements.

• Mechanical Compatibility: Confirm the Φ20mm × 20mm installation envelope and mounting interface.

• Torque Requirements: Select an appropriate gear ratio based on the required continuous and peak torque.

• Power Supply: Match the 12V, 24V, or 48V version to the system power architecture.

• Position Feedback: Check compatibility between the absolute magnetic encoder and the host controller.

• Communication Protocol: Ensure that the control system supports the SPI interface.

• Operating Conditions: Evaluate temperature, duty cycle, mechanical loading, and other application-specific requirements.

Providing the intended application, installation drawings, and control requirements can help determine the most suitable configuration.

About VAXOR

VAXOR is a micro-drive technology company founded in 2024 and headquartered in Suzhou, China. The company focuses on developing micro joint actuators and ultra-micro coreless motors for robotics, medical devices, precision instruments, and intelligent equipment.

By combining axial-flux motor technology, PCB/FPCB winding, optimized electromagnetic design, and miniature reduction mechanisms, VAXOR develops compact motion solutions with high torque density, fast response, precise control, and high efficiency.

R&D and Engineering Capabilities

• Interdisciplinary R&D Team: Expertise covering motor design, precision manufacturing, structural engineering, robotics control, and intelligent manufacturing.

• Engineering Development: Capabilities extending from prototype validation and pilot production to batch delivery.

• International Technical Background: Core team members with academic and industrial R&D experience from China and overseas.

• Long-Term Technical Focus: Dedicated to high-performance micro motors and intelligent equipment.

• Scalable Manufacturing Development: Focus on translating advanced motor technologies into practical and scalable production solutions.

VAXOR products have been supplied or sampled to robotics companies, technology enterprises, and research institutions worldwide.

The company's technology roadmap focuses on three core requirements of micro-drive systems: compact size, high performance, and scalable production. Its solutions are developed to support the growing demand for smaller, more powerful, and more intelligent motion systems.

Ordering Information

To help identify the appropriate micro joint actuator configuration, buyers and engineering teams are encouraged to provide the following information when making an inquiry:

• Required actuator model or series

• Operating voltage: 12V, 24V, or 48V

• Preferred gear ratio: 15:1, 30:1, or 50:1

• Required continuous and initial torque

• Mechanical installation dimensions

• Encoder and SPI communication requirements

• Intended application and operating conditions

• Estimated order quantity

Technical drawings and system integration requirements can also be provided for configuration evaluation.

Compact Motion Solutions for Next-Generation Robotics

For robotic developers and intelligent equipment manufacturers seeking high-performance miniature drive components, the X20 series offers an integrated approach to compact joint actuation. Its axial-flux motor architecture, high torque density, absolute magnetic encoder, and lightweight structure support the development of space-efficient motion systems.

With a dedicated focus on micro-drive technology and engineering implementation, VAXOR provides miniature actuator solutions for robotics, precision instruments, medical equipment, and intelligent devices.

Contact us to learn more about the Φ20mm Micro Joint Actuator, discuss technical specifications, and explore suitable micro-drive configurations for your application.