Cryogenic magnetostrictive actuators and stepper motors

Chad H. Joshi

doi:10.1117/12.406546

16 November 2000 Cryogenic magnetostrictive actuators and stepper motors

Chad H. Joshi

Proceedings Volume 4131, Infrared Spaceborne Remote Sensing VIII; (2000) https://doi.org/10.1117/12.406546
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

Energen, Inc. has developed actuators based on cryogenic magnetostrictive materials. These actuators are designed to provide precision positioning and active control of adaptive optical surfaces such as those that are being considered for the Next Generation Space Telescope (NGST). The NGST is a large 8-mm diameter segmented reflecting telescope that uses a thin optical surface mounted on a rigid composite backstructure. The mounts consists of multiple actuators that are used to align the mirror segments and actively control the radius of curvature for optimum optical performance. Energen, Inc. has developed several types of actuators. A linear actuator consists of a rod of magnetostrictor surrounded by an electric coil that when energized causes the rod to elongate. These type of actuators are used for high speed active control. Energen also has developed a linear stepper motor that consists of an actuator mounted in two clamps. By operating the clamps and actuator in the proper sequence the actuator indexes forward and backward. Submicron positioning resolution along with strokes of 20 mm are possible. Furthermore, the stepper motor locks into position when powered off--ideal for applications where position must be held for long periods of time.

Citation Download Citation

Chad H. Joshi "Cryogenic magnetostrictive actuators and stepper motors", Proc. SPIE 4131, Infrared Spaceborne Remote Sensing VIII, (16 November 2000); https://doi.org/10.1117/12.406546

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available