Micro Harmonic Drive Joint Module

Overview

The Weihan Power Joint Module represents a breakthrough in compact motion transmission technology, combining servo motor functionality with mechanical reduction in a single integrated package. Developed for space-constrained industrial applications, these modules achieve torque outputs up to 300Nm while maintaining precise angular positioning (±0.01° repeatability). Unlike traditional gearbox-motor combinations, the Weihan module features a unified housing that protects internal components from contamination while optimizing heat dissipation. This design philosophy makes it particularly suitable for robotic joint applications where multiple axes require coordinated movement in tight spaces.

Structure and Working Principle

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At its core, the module employs a planetary gear system with hardened steel gears that provide 10,000+ hours operational life under normal loads. The input stage connects directly to a brushless servo motor winding, while the output flange incorporates high-capacity cross roller bearings for moment load support. The integrated absolute encoder provides 20-bit resolution feedback, enabling precise closed-loop control without external sensors. A key innovation is the module's torsional stiffness (rated at 50Nm/arcmin), which minimizes backlash during direction changes - critical for machining and pick-and-place applications.

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Key Features

With power densities reaching 150W/kg, these modules outperform conventional solutions by 30-40%. The IP65-rated housing allows operation in environments with dust or light fluid exposure, while optional cooling fins extend continuous duty performance. Notable engineering features include vibration-optimized gear tooth profiles, preloaded bearing arrangements, and standardized mounting interfaces (ISO 9409-1 compliant). The modules support EtherCAT and CANopen communication protocols out of the box, simplifying integration with most industrial control systems.

Application Areas

Primary industrial deployments include articulated robot arms (particularly 6-axis cobots), rotary indexing tables, and automated tool changers. In semiconductor manufacturing, they drive precision wafer handling systems requiring cleanroom compatibility. The medical device industry utilizes sterilizable versions for surgical robot joints, while packaging lines benefit from their rapid start-stop capability. Emerging applications include aerospace component positioning and renewable energy system actuators where reliability under variable loads is paramount.

Maintenance and Precautions

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Recommended maintenance involves biannual greasing (using specified synthetic lubricants) and annual bearing preload checks. The modules incorporate wear sensors that trigger maintenance alerts via the control interface. Critical precautions include avoiding axial loads exceeding 15% of radial capacity and maintaining ambient temperatures between -15°C to 50°C. Electrical connections require proper shielding to prevent EMI interference with encoder signals. Always verify grounding when installing in metal frameworks.

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B2B Procurement Guide

Industrial buyers should request torque-speed curves specific to their duty cycle, as continuous vs peak ratings vary significantly. Lead times typically range 8-12 weeks for custom configurations (reduction ratios from 1:3 to 1:120 available). Key procurement considerations include: matching the module's natural frequency to application requirements to avoid resonance; verifying brake options for vertical installations; and evaluating smart features like condition monitoring outputs. Bulk orders (10+ units) often qualify for 15-20% discounts from authorized distributors.