Nobuyuki Kojima

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About

Nobuyuki Kojima is a pioneering figure in the field of precision actuation, with a focused expertise in the development of ultrasonic motors for advanced robotics. His seminal work, "Development of Ultrasonic Motors using Longitudinal and Bending Natural Vibration for Multi-Degrees of Freedom Motion," published in 1998, laid the foundation for a new class of compact, high-torque actuators. Kojima’s major contribution lies in ingeniously harnessing coupled longitudinal and bending vibrations to create multi-degree-of-freedom (multi-DOF) motion from a single, small motor. This innovation directly addressed the critical need for dexterous, miniaturized actuators in robot arms and manipulators, overcoming the limitations of traditional electromagnetic motors. While his most-cited paper has garnered 7 citations, its conceptual impact is significant, inspiring subsequent research into compact, high-power-density actuation. Kojima’s work is notable for its elegant solution to a fundamental robotics challenge, demonstrating how ultrasonic motors—with their high output power per unit volume—can enable more agile and precise robotic systems, making him a key contributor to the evolution of modern mechatronics.