Industrial robots have become an integral part of modern production and, due to their serial kinematics, offer a high degree of flexibility in a small installation space. The Fraunhofer IFAM in Stade has developed a hybrid drive to increase robot dynamics. It combines the conventional gear drive with a parallel direct drive that applies the torque directly to the load side. This compensates for gearbox effects and dampens vibrations at higher frequencies.
The result: improved accuracy, stability and responsiveness. Dynamic tests carried out using the ISO 9283 test track show a significant increase in path accuracy. The system compensates for gear errors and friction effects, leading to constant and homogeneous path behavior across the entire workspace. The additional damping of the axis by the torque drive enables up to 100 times higher jerk settings in robot controllers and improves its disturbance rejection. These properties lead to increased productivity and robustness in the process – critical for machining high-strength materials like steel.
Robots with hybrid drives close the gap between standard robots and machine tools. They offer superior accuracy, dynamics and robustness, making them ideal for industries like automotive, energy, aviation as well as shipbuilding, shaping the future of automation.
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