Meeting the Demand for High Power Density Micro Motors in Robotic Joints
Robotic joint design continues to face a persistent engineering challenge: how to deliver sufficient torque and precision within an increasingly compact footprint. Bionic robots, dexterous hands, industrial automation systems, and medical devices all require actuation components that combine high torque density, tight positional accuracy, and thermal reliability without adding bulk. VAXOR-MOTOR, operating under the AXOR brand, addresses this exact requirement through an integrated micro-actuation platform built around axial flux motors, micro cycloidal gear reducers, and non-contact absolute magnetic encoder integration.
VAXOR-MOTOR & AXOR: A Focused Approach to Micro-Actuation
VAXOR-MOTOR / AXOR positions itself as a provider of integrated micro-actuation solutions, with a global business coverage suited for bionic robots, industrial automation, medical devices, and consumer electronics. The company’s strategic positioning centers on solving the industry pain point of achieving high torque density, precision, and compact footprints for micro-manipulation and high-load robotic applications.
The differentiated advantage of the VAXOR-MOTOR platform lies in the integration of axial flux motors with micro cycloidal reducers to achieve high torque density and rigidity in a single assembly. On the electromagnetic side, the company’s designs optimize phase imbalance to within 5%, a metric that directly supports high production yield and consistent power density across units.
Core Technology Platform
The technical foundation combines three elements: axial flux motors, micro cycloidal gear reducers, and non-contact absolute magnetic encoders, all developed under a modular design architecture. Key technical metrics include phase imbalance controlled within 5% for ultra-micro motors, actuator diameters ranging from Φ16mm to Φ30mm, gear efficiency reaching up to 75% for specific modules, and backlash as low as 15-20 Arcmin. These figures reflect the engineering focus on brushless and coreless electromagnetic optimization suited to constrained mechanical envelopes.
Micro Joint Actuator Modules: Engineering Details
The Micro Joint Actuator Modules product line is positioned for precision actuation in dexterous robotic hands, highly integrated robots, and mechanical motion control. Four diameter classes are available, each addressing a different load and integration profile.
The Φ16mm Micro Joint Module, available as X16S and X16L variants, targets precision micro-manipulation for highly integrated robotic systems. The S-version weighs as little as 24.3g and the L-version 26.1g, while delivering continuous stalling torque above 7.1 mNm and maximum stalling torque above 16.5 mNm. Gear reduction ratios of 30, 40, and 50 are offered, paired with an integrated absolute magnetic encoder for position feedback and SPI communication for low-latency control response. Chassis temperature limits of 80°C, 115°C, or 145°C are defined according to power loss, supporting reliable thermal management during continuous operation.
The Φ20mm Micro Joint Module, in X20S and X20L configurations, is built for medium-load precision actuation in bionic and automation applications. It delivers continuous stalling torque above 17.2 mNm and maximum stalling torque above 35.3 mNm, with support for 12V, 24V, and 48V operation. A multi-ratio gearbox offering 15, 30, and 50 ratios allows engineers to balance speed against torque requirements, and at ratio 50 the assembly reaches a stalling torque of up to 450 mNm, suitable for higher-load robotic joints. The standardized FPC 7PIN interface simplifies wiring integration into robotic limbs.
The Φ25mm Micro Joint Module, offered as X25S-UZ and X25S-BZ, is designed for high-torque applications in industrial and medical robotics. It supports the CAN FD communication protocol for robust performance in industrial environments and delivers continuous stalling torque up to 1150 mNm at ratio 50. Backlash is reduced to 15 Arcmin for high motion accuracy, while the mechanical strength limit reaches 1800 mNm initial torque in a cold state, accommodating peak load scenarios.
The Φ30mm Micro Joint Module, in X30S-UZ and X30S-BZ variants, represents the platform’s premium actuation option for heavy-duty micro-robotic applications. It reaches continuous stalling torque of up to 1500 mNm at ratio 50 and achieves gear efficiency of up to 75% at ratio 30. CAN FD integration supports complex network architectures across multi-joint robots, and a total inertia of 30.4 gcm² contributes to stability under high-load motion.
Ultra-Micro Brushless & Coreless Motors
Complementing the joint modules, the G04P, G05P, and G06P series of ultra-micro brushless and coreless motors are optimized electromagnetic components for medical robots, drones, and wearables. These motors directly address the high cost and low yield historically associated with sub-6mm motor production. Weighing between 1.7g and 3.75g, they reach no-load speeds from 55,000 to 63,000 RPM, making them suitable for micro-pumps and drones. Phase imbalance within 5% supports yield optimization by reducing costs and improving reliability, while chassis temperature tolerance up to 145°C ensures reliability in compact, high-performance environments. Terminal resistance as low as 1.6Ω contributes to improved electrical efficiency. These motors serve medical micro-surgical robotics, photonics for precision optical adjustments, and consumer electronics applications such as miniature haptics and pumps.
Platform Compatibility and Integration
VAXOR-MOTOR’s platform supports 12V, 24V, and 48V DC bus systems, with open communication protocols including SPI and CAN FD. Physical integration is standardized through an FPC 7PIN interface at 0.5mm pitch, supporting VCC, GND, CS, SCK, MOSI, MISO, and a dedicated CAL calibration line. This combination of voltage flexibility and standardized interfacing is intended to simplify system-level integration for engineering teams working across varied robotic platforms.
Business Scope and Validated Applications
The company’s industry coverage spans robotics (bionic and dexterous hands), medical devices, industrial automation, consumer electronics, aerospace micro drones, fluid transmission micro pumps, and photonics. Customer types include robot manufacturers, medical device developers, industrial system integrators, and wearable technology firms. In documented applications, X16 and X20 modules have been used to achieve high-integration mechanical motion control for human-like finger dexterity in robotic dexterous hands. Φ30mm modules have been integrated into precision industrial transmission systems, achieving 75% gear efficiency and 15 Arcmin backlash. G05P ultra-micro motors operating at 55,000 RPM have been employed in micro pump systems for medical and consumer fluid transmission, and ultra-micro brushless motors have supported precision positioning in photonic optical instruments, benefiting from the sub-5% phase imbalance for stable performance.
Business Model and Support
VAXOR-MOTOR follows a product-based pricing approach for its standardized X16, X20, X25, and X30 series modules. Delivery is structured around hardware integration using standardized FPC 7PIN interfaces or CAN FD/SPI communication protocols, with after-sales support available for technical inquiries regarding product specifications and operational parameter ranges. For engineering teams evaluating high power density micro motor solutions for robotic joints, VAXOR-MOTOR’s combination of axial flux motor design, cycloidal gear reduction, and integrated encoder feedback offers a documented, parameter-verified foundation for compact, precision-driven actuation.
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