D. J. Ehrlich

Papers

Total Citations

271

H-Index

About

D. J. Ehrlich is a pioneering figure in microelectromechanical systems (MEMS), with a primary focus on the development of piezoelectric micromotors for microrobotics. Their most influential contribution, the 1992 paper "Piezoelectric micromotors for microrobots," has garnered 229 citations and established foundational techniques for fabricating millimeter-scale ultrasonic motors using ferroelectric thin films on silicon wafers. Ehrlich's work addresses critical challenges in miniaturized actuation by creating traveling-wave stators that drive rotors—such as small glass lenses—without the friction and scaling issues plaguing conventional electromagnetic motors. A subsequent 2002 paper (42 citations) refined these designs, demonstrating practical, compact motors that overcome electrostatic limitations. By integrating piezoelectric thin films with silicon microfabrication, Ehrlich enabled precise, high-torque motion at unprecedented scales, directly advancing the feasibility of autonomous microrobots. Their research remains a cornerstone for engineers developing microactuators for medical devices, optical systems, and inspection robots, with citation impact spanning decades. Ehrlich’s work exemplifies how materials science and mechanical design converge to create transformative microsystems.