Boxin · Hengzhen · Botrust
Precision Manufacturing・Powering the World
ERob 70F
The eRob 70F is an ultra-compact, all-in-one robotic joint module with an outer diameter of 70 mm and a weight as low as 0.77 kg. It delivers a rated output torque of 5.4 N·m and integrates a motor, harmonic reducer, dual encoders, and a drive unit. Supporting multiple communication protocols including EtherCAT, it serves as an ideal joint solution for lightweight collaborative robots, medical devices, and educational/research platforms, while also enabling customized development.
- Product Description
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I. Product Overview
eRob 70F is Ultra-compact integrated robotic joint module It integrates core components such as a frameless torque motor, harmonic reducer, dual absolute encoders, and a servo drive, offering a standardized solution for collaborative robots and small industrial robot joints, with lightweight design, high precision, and high integration as its key advantages.
II. Core Technical Parameters (Standard Version Without Brakes)
Project Parameter value Model number eRob 70F (Straight Tube Type I) Outer diameter 70 mm Length 60.4 mm (without brake) / 67.7 mm (with brake) Total weight 0.77 kg (without brake) / 0.83 kg (with brake) Hollow shaft diameter 18 mm (wire-passable) Start-stop peak torque 19 N·m (mainstream reduction ratio, 100 version) Rated output torque 5.4 N·m Instantaneous maximum torque 35 N·m Maximum output speed 60 RPM Reduction ratio 50 / 80 / 100 (optional) Motor-end encoder 19-bit absolute encoder Output-side encoder Multi-turn absolute encoder Communication protocol EtherCAT / CANopen / Modbus Operating voltage 24~48V DC Protection rating IP54
III. Structure and Core Features
- Fully integrated design
- It features a built-in frameless torque motor, a precision harmonic reducer, dual encoders, a servo drive, and a temperature sensor (with an optional torque sensor), enabling plug-and-play operation with a single module and significantly streamlining the robot development process.
- Ultra-compact, lightweight design
- With an outer diameter of just 70 mm and a weight as low as 0.77 kg, and featuring an 18-mm hollow shaft that supports internal cable routing, it is ideally suited for joint applications in collaborative robots and lightweight robotic arms.
- High precision and high rigidity
- Employing a harmonic reducer paired with dual absolute encoders, this solution delivers high repeat positioning accuracy, supports high-precision trajectory control, and boasts exceptional resistance to overturning moments.
- High-Security Design
- Optional friction‑type brake holder, supporting the Safe Torque Off (STO) function and complying with safety standards for collaborative robots.
- Multi-protocol compatibility
- Supports mainstream industrial buses such as EtherCAT and CANopen, enabling direct integration with PLCs and robot controllers, and offering excellent compatibility.
IV. Typical Application Scenarios
- Lightweight collaborative robot: joint drive for a desktop robotic arm with a payload of 3–5 kg.
- Medical Robots: Precision Actuation for Surgical Instruments and Rehabilitation Robots
- Automation equipment: precision rotary stages, optical instruments, and rotary joints for AGV vehicles.
- Education and Research: University Robotics Teaching Platform, Small-Scale Industrial Robot R&D Project
V. Model Naming Conventions
Complete model format:
eRob 70F – Reduction Ratio – Braking Option – Additional CodeExample:
eRob 70F-100-BeRob 70F: Series model (70 denotes the outer diameter specification, F denotes the straight‑tube type)100: Reduction ratio (optional 50/80/100)B: With brake version; the non-brake version does not bear this marking.
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