COVER STORY
works extensively in the MedTech field, contributing to projects like the bebionic3, recognised as one of today’s most advanced bionic hands. Developed by prosthetic manufacturer Steeper, the bebionic3 offers full motion compliance, with each digit individually powered. To maintain this functionality in a smaller hand without compromising performance, Steeper’s Technical Director Ted Varley emphasised the need for a high-power Ø 10mm motor gearbox and encoder. “Our design ethos prioritises placing the motors in the palm to facilitate a more efficient gearbox design and reduce perceived mass, enabling full finger flexion and lifelike movement.” Transitioning from 15mm Ø
Faulhaber motors to a new 10mm Ø motor, Steeper collaborated with EMS and Faulhaber to develop the motor 1024M006SR, tailored for the bebionic3. This motor features enhanced components for improved performance, including a redesigned end cap for easier assembly, more accurate brush positioning, and integrated commutator and brushes with precise geometry. These enhancements yielded superior performance, particularly in grip patterns and stall conditions, with a highly dynamic, flat speed/torque curve ideal for the application. Moreover, Faulhaber addressed the
challenging requirement for a thumb actuator, leveraging their expertise to develop an in-line linear actuator capable of delivering high force in a compact form. Integrating a high precision 4-point contact bearing from their group company Micro Precision Systems (MPS), Faulhaber produced the most powerful and smallest linear actuator capable of sustaining axial forces up to 300N. The unique characteristics of
the bearing enabled a significantly shorter overall length compared with conventional bearings, highlighting Faulhaber’s commitment to innovation in meeting complex MedTech requirements. Through collaborative efforts and
innovative solutions, companies such as Open Bionics, EMS, Faulhaber, and Steeper – all in which specialise in developing different technologies – continue to drive advancements in bionic technology, enhancing the lives of prosthetic users worldwide.
www.engineerlive.com 9
The bebionic
commercial hand at the Design Engineering Expo
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