eRob Series of Robotic Joint Modules with Integrated Servo and RS485/EtherCAT

• ✔ Complete integrated solution for robotic joints
• ✔ Dual 19-bit absolute encoders for unmatched accuracy
• ✔ Support for EtherCAT and CANopen communication buses
• ✔ Extremely compact design with low weight and through-hole
• ✔ Vibration-free friction brake for stable movement and positioning
• ✔ Significant acceleration and simplification of robotic system development

Discover the cutting-edge eRob robotic joint modules, a breakthrough in modular design and integration for robotic arms and automation devices. These standardized modules are the result of years of experience and deliver a complete solution that dramatically simplifies, accelerates and secures robot development.

⚙️ What can this robotic articulated module do?

• Complete integration: Each module elegantly integrates a servo drive, motor absolute encoder, output absolute encoder, frameless torque motor, brakes, and precision harmonic reducer, eliminating the need to select and assemble hundreds of mechanical and electronic components.
• Dual absolute encoders: Built-in 19-bit absolute encoders on both the motor and output sides provide fully closed-loop control and repeatable positioning accuracy of up to ±10 arc seconds.
• High torque density: For example, the eRob70 model, weighing just 0.98 kg, achieves a torque-to-weight ratio of up to 50 Nm/kg.
• Compact through-hole design: The modules feature a minimalist through-hole design (e.g. 18 mm for eRob70), allowing easy routing of cabling or media directly through the joint.
• Universal connectivity: Support for EtherCAT and CANopen communication protocols with open data loops for position, speed and current, including real-time PID tuning.
• Reliable friction brake: The modules are equipped with a friction-damped brake that guarantees smooth, shock-free stopping and the ability to start from zero speed under full load.

🔍 Explore every detail – Innovations for your robotic system

The modular eRob series, including models such as the eRob70, eRob80, eRob90, eRob110 and eRob142, represents a revolutionary approach to robotic joint design. Each module is a masterpiece of precision engineering, combining compactness, high integration and robust performance.

The manufacturer designed these modules to minimize the complexity, time and cost associated with developing and assembling robotic systems. With key components pre-integrated – from motors and encoders to reducers and brakes – developers can skip the time-consuming selection, design and assembly processes.

With fully enclosed control and single and multiple power-off memory, you can be assured of unmatched accuracy and reliability in every application. These modules are ideal for dynamic, variable inertia applications where precise and fast control is key.

📉 Are you bothered by the complex and time-consuming development of robots?

The design of modern robotic arms requires the integration of many complex components: servomotors, encoders, gearboxes, brakes and controllers. Each of these elements must be carefully selected, designed for mounting, ensured compatibility and then intricately assembled. This process is costly, increases development time and increases the risk of errors.

🚀 Get your time and accuracy back with eRob modules!

The eRob family offers standardized, fully integrated articulated modules that address these challenges. With a complete package in a compact design, you eliminate the need for complex component selection and time-consuming assembly. eRob modules allow you to focus on the innovation and functionality of your robot, while the integrated solution takes care of the accuracy and reliability.

📈 More than just features, real benefits for your production

• Features: Complete integration of servo, encoders, motor, reducer and brake into a single unit. Benefits: Dramatically reduce time and cost of design, component selection and assembly, accelerating time to market.
• Features: Dual absolute 19-bit encoders with fully closed control. Benefits: Unparalleled repeatable positioning accuracy (up to ±10 arcsec) and absolute precision, ensuring reliability and repeatability of tasks.
• Function: Friction damped brake. Benefit: Smooth and stable stopping and starting without vibration, which is crucial for sensitive applications and handling fragile objects.
• Features: Supports EtherCAT and CANopen with open control loops. Benefits: Easy integration into a wide range of industrial systems and flexibility to adapt to dynamic loads and variable inertia.
• Features: Compact design, low weight and through-hole. Benefits: Optimize the weight and dimensions of robotic arms, improve their agility and allow for cabling inside the joint.

🎯 For whom are eRob articulated modules the ideal choice?

• For developers and designers of collaborative robots (cobots) where precision and smooth movement are key.
• For engineers designing medical robots and devices requiring high reliability and precise handling.
• For manufacturers and automation system integrators looking for fast and efficient solutions for robotic arms.
• For research and development teams that need flexible and high-performance modules for prototyping robotic applications.

❓ Do you have any concerns? We will dispel them!

• Concern: Complexity of integrating multiple components into a robotic joint. Answer: eRob modules are complete integrated units that eliminate the need to separately select and assemble servos, encoders, motors, and reducers.
• Concern: Insufficient positioning accuracy and repeatability for demanding applications. Answer: With dual 19-bit absolute encoders and fully enclosed control, the modules achieve repeatability of up to ±10 arcsec, ideal for high-precision tasks.
• Concern: Problems with dynamic load control and instability during start/stop. Answer: EtherCAT/CANopen support and friction brake ensure stable and smooth operation even under full load and in dynamically changing environments.

🛠️ Technical specifications

Parameter	Description / Value
Common features for the entire eRob series
Supply voltage	48V (±10%)
Output encoder resolution	19 bits
Positioning accuracy (repeat/absolute)	±10 arcsec / ±45 arcsec
Communication bus	EtherCAT, CANopen
Interface design	Fully differential, strong interference protection; dual connectors for serial connection
Brake	Friction dampened
Harmonic reducer gear ratio options
For eRob70/80/90 models	14-50, 14-80, 14-100, 17-50, 17-80, 17-100, 20-80, 20-100
For eRob110/142 models	25-100, 25-120, 32-100, 32-120
Performance parameter ranges (depending on model and selected gear)
Peak start/stop torque	18/23 Nm to 353/459 Nm
Rated torque	5.4/7 Nm to 137/178 Nm
Max. allowed torque	35/46 Nm to 686/892 Nm
Top output speed	16.7 RPM to 60 RPM
Specific parameters according to model
Model	eRob70	eRob80	eRob90	eRob110	eRob142
Motor power (W)	100	200	400	750	1000
Rated current (A)	3.3	6.9	11	20	26
Peak current (A)	11	16.8	29	40	56
Dimensions (Ø x L x through hole, mm)	70x81x18	80x95x18	90x102x18	110x127x18	142x137x18
Weight (kg)	0.98	1.4	2.1
Package contents
Power connectors	2x 48V (2pin)
CANopen connectors and cabling	2x
EtherCAT connectors and cabling	2x (4pin)
I/O connector and cabling	1x (12pin)

💬 Frequently Asked Questions (FAQ)

What are the main advantages of eRob modules over traditional robotic joint assembly?

eRob modules provide complete integration of all key components (servo, encoders, motor, reducer, brake) into one compact unit. This significantly simplifies design, reduces assembly time and costs, and minimizes the risk of errors in component selection and compatibility.

What positioning accuracy do eRob modules offer?

With dual 19-bit absolute encoders and fully closed control, eRob modules achieve repeatable positioning accuracy of up to ±10 arc seconds and absolute accuracy of ±45 arc seconds, which is crucial for demanding robotic applications.

What communication protocols are supported?

eRob modules support the widely used industrial communication buses EtherCAT and CANopen, allowing easy integration into most existing automation systems.

What types of robots are eRob modules best suited for?

They are ideal for collaborative robots, medical robots, and other automation devices where high accuracy, reliability, compact design, and development efficiency are emphasized.

How does the braking system work and what is its benefit?

eRob modules are equipped with a friction-damped brake that ensures smooth stops and starts without any jolts. This allows the robot to operate stably even under full load from zero speed, increasing the safety and accuracy of operations.

Is it possible to connect the modules in series and what interfaces do they use?

Yes, the modules use a fully differential interface design with dual, loosen-resistant connectors, allowing for easy and reliable serial connection of multiple modules in a robotic arm with high immunity to interference.

How do the individual models within the eRob series differ (e.g. eRob70 vs. eRob142)?

The models differ primarily in their dimensions (outer diameter and length), motor power, rated and peak current, weight, and available ranges of harmonic reducer gear ratios, torques, and output speeds to suit different load and space requirements.