High-authority electroceramic actuators for adaptive structures

Mark A. Ealey; Robert K. Bradway; Mark B. Solomon

doi:10.1117/12.259039

20 November 1996 High-authority electroceramic actuators for adaptive structures

Mark A. Ealey, Robert K. Bradway, Mark B. Solomon

Proceedings Volume 2865, Actuator Technology and Applications; (1996) https://doi.org/10.1117/12.259039
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Energy density is the key to higher authority actuators. New generation electroceramics, such as temperature stabilized lead magnesium niobate (PMN), generate large forces which can do work in adaptive structures. Ever increasing induced- strains and energy conversion efficiencies require process advances to handle high applied electric fields which are required to fully utilize the saturation strain of the materials. The PMN-based family of materials provide output energy which exceeds magnetostrictive TERFENOL by a factor of 16 and piezoelectric lead zirconate titanate (PZT) by a factor of 4. By tailoring the formulation, the PMN materials have been temperature stabilized to function from -50 to 150 degrees C. Cofired stacks which are 1 inch n diameter and epoxy bonded stacks which are 2 inches in diameter have been produced and operated to induced-strains as large as 1000 ppm. Key to tapping the energy in electroceramics is a mechanical amplifier or mechanism which can efficiently convert force into displacement. Amplification ratios up to 10:1 have been built and integrated with electroceramic stacks. Electronic amplifiers are also required to handle the highly capacitive loads of high authority actuators. Switching and linear amplifiers are compared in terms of power and efficiency.

Citation Download Citation

Mark A. Ealey, Robert K. Bradway, and Mark B. Solomon "High-authority electroceramic actuators for adaptive structures", Proc. SPIE 2865, Actuator Technology and Applications, (20 November 1996); https://doi.org/10.1117/12.259039

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