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Integrated Robot Joint Actuator for Industrial Automation

Industrial automation systems increasingly require actuation that delivers high torque density, positional accuracy, and a compact mechanical footprint. The integrated robot joint actuator category answers that requirement by combining the motor, gear reduction, and position feedback into a single module instead of a stack of separately sourced components. VAXOR-MOTOR / VAXOR operates in this segment as a provider of integrated micro-actuation solutions, with a platform built around axial flux motors, micro cycloidal gear reducers, and non-contact absolute magnetic encoders.

What Defines an Integrated Robot Joint Actuator

The stated industry pain point behind this product category is the need for high torque density, precision, and compact footprints in micro-manipulation and high-load robotic applications. A traditional joint must be assembled from a motor, a separate gearbox, an encoder, and the wiring between them. Each interface adds assembly steps, alignment risk, and volume.

VAXOR-MOTOR’s approach consolidates these functions. Its technical platform integrates axial flux motors, micro cycloidal gear reducers, and non-contact absolute magnetic encoders, and its technical methods rely on a modular design architecture with optimized electromagnetic design for brushless and coreless systems. The company reports the following technical metrics across the platform:

• 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
• Backlash as low as 15-20 Arcmin

For industrial automation engineers, phase imbalance within 5% matters because it supports high yield and power density in volume manufacturing, while the diameter range allows a single design language to scale from compact grippers to heavier joint assemblies.

The Micro Joint Actuator Module Line

The product line is positioned as precision actuation for dexterous robotic hands, highly integrated robots, and mechanical motion control.

Φ25mm Micro Joint Module (X25S-UZ / X25S-BZ)

Positioned for industrial and medical robotics, this module uses the CAN FD protocol for communication in robust industrial environments. Continuous stalling torque reaches up to 1150 mNm at ratio 50, with reduced backlash of 15 Arcmin for motion accuracy. Torque capacity extends to 1800 mNm in the initial torque cold state, which suits peak load scenarios.

Φ30mm Micro Joint Module (X30S-UZ / X30S-BZ)

For heavy-duty micro-robotic applications, the Φ30mm module delivers continuous stalling torque up to 1500 mNm at ratio 50 and up to 75% gear efficiency at ratio 30. CAN FD integration supports complex network architectures for multi-joint robots, and a total inertia of 30.4 gcm² contributes stability in high-load motion.

Φ16mm and Φ20mm Modules (X16S / X16L, X20S / X20L)

The Φ16mm module targets precision micro-manipulation in highly integrated robotic systems. Units weigh as little as 24.3g (S-version) or 26.1g (L-version), with continuous stalling torque above 7.1 mNm and stalling torque (max) above 16.5 mNm. Integrated gear reduction is available in ratios of 30, 40, and 50, and an absolute magnetic encoder provides position feedback. Communication uses SPI for high-speed data exchange, and chassis temperature limits of 80°C / 115°C / 145°C are based on power loss to prevent overheating.

The Φ20mm module covers medium-load precision actuation for bionic and automation applications, with continuous stalling torque above 17.2 mNm and stalling torque (max) above 35.3 mNm, and it supports 12V / 24V / 48V operation. Its multi-ratio gearbox offers 15, 30, and 50 ratios to balance speed and torque, reaching up to 450 mNm high stalling torque at assembly at ratio 50. A FPC 7PIN interface standardizes wiring for power and data.

Integration, Interfaces, and Bus Compatibility

Platform compatibility covers 12V, 24V, and 48V DC bus systems, which lets integrators standardize a joint design across low-voltage and higher-voltage architectures. Communication protocols include SPI and CAN FD. The interface is an FPC 7PIN (0.5mm pitch) connection supporting VCC, GND, CS, SCK, MOSI, MISO, and CAL (calibration). The dedicated CAL line is a practical detail for automation deployments, since calibration can be handled as part of the standard connector rather than through a separate service procedure.

Documented Applications and Quantified Results

The knowledge base records several benchmark cases that indicate how the platform is being applied:

• Robotic dexterous hands: X16 and X20 modules were used to achieve high-integration mechanical motion control, enabling human-like finger dexterity.
• Industrial automation: Φ30mm modules were integrated into precision transmission systems, achieving gear efficiency of 75% and reducing mechanical backlash to 15 Arcmin.
• Micro pump systems: G05P ultra-micro motors rated at 55,000 RPM drove fluid transmission in medical and consumer applications, supporting low cost and high power density.
• Photon optics: Ultra-micro brushless motors were applied for precision positioning in optical instruments, benefiting from the <5% phase imbalance for stable performance.

The ultra-micro motor line, covering the G04P / G05P / G06P series, addresses the pain point of high cost and low yield in sub-6mm motor production. These units weigh 1.7g to 3.75g and reach no-load speeds from 55,000 to 63,000 RPM, with terminal resistance as low as 1.6Ω and chassis temperature support up to 145°C. Industry adaptation spans medical micro-surgical robots, precision optical adjustments, and miniature haptics and pumps in consumer electronics.

Delivery Model, Service, and Evaluation Approach

The business model is product-based sales for standardized modules across the X16, X20, X25, and X30 series. Deployment combines hardware integration with standardized FPC 7PIN interfaces or CAN FD / SPI communication protocols. The service model is hardware provision plus technical integration support, with the assurance of detailed technical specifications and test data for electric drive assemblies so that performance parameters such as torque, speed, and thermal data can be verified before design freeze.

Why VAXOR-MOTOR Fits Industrial Automation Programs

For automation engineers evaluating an integrated robot joint actuator, three factors tend to govern selection: whether torque density is sufficient for the load case, whether backlash and feedback precision support the required motion accuracy, and whether the interface can be absorbed into an existing control architecture. VAXOR-MOTOR addresses these through the axial flux motor and micro cycloidal reducer combination, backlash as low as 15-20 Arcmin, absolute magnetic encoder feedback, and native support for SPI, CAN FD, and a 7-pin FPC connector across 12V, 24V, and 48V buses. The company remains open to discussions regarding product-related questions and parameter range verification.

http://www.vaxor-motor.com
Suzhou Vaxor-motor CO.,LTD.

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