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Title: Lead magnesium niobate actuator for micropositioning

An improved lead magnesium niobate actuator is disclosed comprising a cylindrical lead magnesium niobate crystal stack mounted in a cylindrical casing wherein a bias means, such as one or more belleville washers, is located between one end of the crystal stack and a partially closed end of the casing; and adjustment means are provided which bear against the opposite end of the crystal stack, whereby an adjustable compressive force is constantly applied against the crystal stack, whether the crystal stack is actuated in an extended position, or is in an unactuated contracted position. In a preferred embodiment, cooling ports are provided for the circulation of coolant in the actuator to cool the crystal stack, and provision is made for removal and replacement of the crystal stack without disconnecting the actuator from the external device being actuated. 3 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
7176912
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; EDB-94-168409
Patent Number(s):
US 5359252; A
Application Number:
PPN: US 8-039614
Contract Number:
W-7405-ENG-48
Resource Relation:
Patent File Date: 30 Mar 1993
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ACTUATORS; DESIGN; COOLING; CYLINDRICAL CONFIGURATION; FASTENING; MAINTENANCE; POSITIONING; CONFIGURATION; FABRICATION; JOINING; 420200* - Engineering- Facilities, Equipment, & Techniques