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Multi-Laminate Bender for Improved Actuators

IP.com Disclosure Number: IPCOM000122838D
Original Publication Date: 1998-Jan-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Related People

Lee, CK: AUTHOR [+2]

Abstract

Disclosed are multi-laminate configurations developed using piezoelectric materials such as lead zirconate titanate (PZT), or electrostrictive material such as lead magnesium niobate (PMN) to enhance the benefit of electromechanical actuating devices suitable for precision mechanical applications. The enhanced benefits include a high displacement-frequency product, low electrical field induced mechanical stress, etc. Fig. 1 shows the basic multi-laminate actuator unit design. It consists of a lamination of active materials such that when a voltage is applied, the material on one side expands while the material on the other side contracts, resulting in bending motion.

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Multi-Laminate Bender for Improved Actuators

      Disclosed are multi-laminate configurations developed using
piezoelectric materials such as lead zirconate titanate (PZT), or
electrostrictive material such as lead magnesium niobate (PMN) to
enhance the benefit of electromechanical actuating devices suitable
for precision mechanical applications.  The enhanced benefits include
a high displacement-frequency product, low electrical field induced
mechanical stress, etc.  Fig. 1 shows the basic multi-laminate
actuator unit design.  It consists of a lamination of active
materials such that  when a voltage is applied, the material on one
side expands while the material on the other side contracts,
resulting in bending motion. One  of the main effects achieved in
this tapered lamination is that both the  mass and the stiffness can
be varied by laminating successively shorter  lengths, while
maintaining a high electric field within each lamina. It  recognizes
that any means of achieving a graded stiffness and mass with  as high
an applied electric filed throughout the material as possible will
produce the same effect.  The optimization gives a higher product
of displacement and actuator resonant frequency.  Another key feature
worth noting is that if a high applied electric field induces a
mechanical stress concentration along the edge of the lamina (simple
derivations show that a concentrated applied force/moment will be
present along the lamination edge (*) as sho...