Alexander S. Shafer

Papers

Total Citations

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About

Alexander S. Shafer is a robotics researcher whose work focuses on the design of inherently safe and efficient robotic manipulators. His primary contributions lie in the development of novel actuation concepts that prioritize human-robot interaction safety without sacrificing mechanical performance. Shafer’s most influential work, the 2013 paper "Design and Development of a Single-Motor, Two-DOF, Safe Manipulator," has garnered 42 citations and introduces a groundbreaking approach using a single unidirectional motor to power multiple joints. This design incorporates magnetorheological (MR) clutches to enable antagonistic actuation, allowing for bidirectional movement while dramatically reducing mechanical complexity and risk of injury. A related paper, with 17 citations, further details this safe actuation concept. By decoupling actuation from traditional high-inertia motors, Shafer’s research paves the way for robots that can operate safely alongside humans in collaborative environments. His work is a key reference for engineers seeking to balance power, precision, and safety in next-generation robotic systems.