Output Encoder for RL-D / RL-S

We supply 2 options of encoders for our joints / joint arms.

Option 1 (our Standard before HMI 2017): Motorencoder plus Ini switch for 0-point reference on the joint output (PRT bearing)

Option 2): Output encoder on the PRT bearing of the joint. This is our own development, we use a magnetic ring plus Encoderchip on the output with an aditional magnet and Hall Sensor as reference point. Please find attached a description of the output encoder attached in GER and ENGL. Advantage: less cables, higher resolution, more accuracy for the arm.

DOWNLOAD section:

output encoder DEU: RL-D Sensorik Doku (#3)

output encoder ENGL: RL-D Sensors Dok (E #3)

strain wave gear (RL-S) vs. cycloid gear (RL-C)

The strain wave gear is available as a product in the size RL-S-17 and RL-S-20. RL-S-30 is a prototype and still in development.

The cyclo gear can be an alternative in future and is not available as a product yet. The sizes 17 and 20 are currently in development.

Both types of gears contain a coaxial in- and output axis (different from RL-D worm gears), they consist of three similar components:

  • An outer (static) toothed ring
  • An inner toothed ring (rigid in the cycloid gear, flexible in the SWG)

  • A drive (an excentric in the case of the cycloid gear, the wave generator in the SWG)



strain wave gear with flexible inner ring                  cycloid gear with excentric ring



Control solution by commonplace robotics

Company Commonplace robotics from GER shows a quick and simple control solution for our modular joint kit. It consists of a set of electronics (incl. stepper motor drivers) and a WINDOWS software package.

More details can not yet be announced, as this is a brand new solution, but we will check more facts within the next weeks. The product is available at Commonplace robotics GmbH:




igus open source soccer robot (with University of Bonn), first kicks…

We have been involved in the development of a new open source teen size soccer robot for 2 years now (and the improvement still goes on!). The main development was done by the University of Bonn, institute AIS, Professor Sven Behnke, who also developped our open source robolink software IME (igus motion editor), igus contrubuted the design and technology of the outer shell parts (made by 3D printing / SLS). In the next stage we will improve the cabeling inside the robot with our chainflex know-how for often bending cables.

This youtube video shows the current state of the software development (thanks to Philipp Allgeuer for sharing it).

The open source project is documented by Prof. Behnke here with open source data: http://www.nimbro.net/OP

And the 3D Step data of the robot shell (3D printed parts) are shared here by igus: https://github.com/igusGmbH/HumanoidOpenPlatform

igus open source soccer robot (with University of Bonn), first kicks...

robot FLASH from Wroclaw University of technology (Poland)

The team of Jan Kedzierski (Ph.D.) from Wroclaw University of technology now presents their NEW generation of the autonomous robot FLASH. It is (again) equipped with 2 pcs. 5 DOF robolink wire driven joint arms. They developpped their own drive technology for this robot based on DC/BLDC motors as an open source project. It will be published soon, I will link to their project then.