In industrial automation, robots are typically designed for a specific task or application. This makes it challenging to adapt systems when requirements change. RobCo, a Munich-based startup, set out to change this with the world’s first modular industrial robot kit that supports 1- to 8-axis configurations.
RobCo’s innovative and end-to-end robotic solutions enable customers to assemble, reassemble, and extend robots as needs evolve. For small-to medium-sized businesses where production changes weekly, this adaptability is a real game-changer. By combining interchangeable arms and joints, RobCo transforms a single component family into an endless number of robotic solutions.
However, as adoption of its modular robot platform increased, RobCo required a dependable motion solution and partner that could perform reliably and scale with its business.
“TBM2G-powered joints deliver low torque ripple, which is important for smooth, slow motion in many applications such as surface grinding. We greatly appreciated Kollmorgen’s co-engineering support throughout all phases of the project to make it a success.”
—Paul Marold, Co-Founder & Head of Customer Value Engineering
Challenge
By offering one joint that addresses multiple robot challenges, RobCo’s modular approach allows customers to optimize for their specific reach, payload and workspace requirements. This flexibility, however, places higher demands on the motion components at the heart of each joint.
A single joint design must perform consistently across a wide range of torque, speed and load conditions while remaining compact enough for embedded robotic designs. It is essential that motion remains smooth and predictable, particularly during slow, controlled movements. Motors must integrate seamlessly with standard mechanical interfaces to preserve modularity and avoid the need for custom designs for each new configuration. Any compromise in size, performance or integration reduces the advantages and benefits of a modular robot platform.
Solution
To meet these requirements, RobCo partnered with Kollmorgen to standardize its robot joint designs using the TBM™2G frameless BLDC (brushless DC) servo motors. Available in seven widely used frame sizes and multiple stack lengths, the TBM2G helped RobCo’s robots deliver high torque and speed in an ultra-compact design.
The motor’s frameless architecture allowed for compact joints with short axial lengths and high torque density. Standardized motor dimensions enabled direct integration with off-the-shelf strain wave gearing, supporting compact rotary joints for industrial robot applications. Finally, the TBM2G’s large inner diameter supported RobCo’s integrated hollow-channel design for cables and hoses to pass through the joint cleanly.
Beyond the hardware, Kollmorgen supported RobCo through a collaborative engineering process focused on long-term stability and manufacturability. Motor performance was validated through analytical simulations and detailed operational data, while application support assisted RobCo’s production team in transitioning to the new motor technology.
Results
With the TBM2G motors in place, RobCo expanded what customers could achieve with a single modular robot system. Using the same core joint architecture, customers can now configure robots with a reach up to 2,100 mm and a payload up to 13 kg, or a reach up to 1,200 mm with a payload up to 40 kg. Existing robots can also be reconfigured for new applications by swapping arms or joints, thereby extending the system lifespan and maximizing flexibility without redesigning the entire robot.
The ultra-compact joints also deliver high torque density and low torque ripple for precise, smooth motion. This is especially important in controlled, slow-speed tasks, such as surface grinding, where motion quality directly affects the finished result.
Since the partnership began, RobCo has steadily scaled production to meet growing market demand and expanded its international presence, all while maintaining reliable performance and preserving the modular flexibility at the core of its platform.
