Development of a cryogenic force actuator

Details Development of a cryogenic force actuator Development of a cryogenic force actuator

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.524..217n&link_type=abstract

In: Proceedings of the 10th European Space Mechanisms and Tribology Symposium, 24-26 September 2003, San Sebastián, Spain. Compi

Computer Science

Performance

Actuators

Scientific paper

This paper summarizes the design and development of a miniature Force Actuator, used in spacecraft optical instruments, notably the James Webb Space Telescope (JWST). The design challenge was to develop a lightweight, compact, high bandwidth, low power, thermally stable force actuator capable of controlling force with a resolution of better than 0.000225 N (5×10-5 lbf). This paper outlines the design, development and testing of the force actuator assembly, with particular emphasis placed on the cryogenic aspects of the design, and the load cell and capacitive sensor development and testing. The paper outlines the following four novel points of the design: 1. Development of a linear actuator capable of a resolution better than 0.64 microns (25 micro-inches). 2. Challenges to meet performance requirements for temperatures of 30K to 350K. 3. Load cell development with linearity better than 0.000225 N. 4. Development of a capacitive displacement sensor capable of resolving a stroke of 2.6 millimeters with an accuracy of 1.3 micron.

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