Stable controller design of a six-degree-of-freedom magnetically       suspended fine-steering mirror

James D. Medbery; Avanindra A. Gupta

doi:10.1117/12.51188

13 January 1992 Stable controller design of a six-degree-of-freedom magnetically suspended fine-steering mirror

James D. Medbery, Avanindra A. Gupta

Proceedings Volume 1543, Active and Adaptive Optical Components; (1992) https://doi.org/10.1117/12.51188
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

Presently, there is a new generation of fine-steering mirrors (FSM) being developed using magnetic suspension. They possess the high bandwidth and line-of-sight stabilization characteristics desirable from an FSM, and eliminate the singlepoint failure concern of the flexure suspension system. These devices, while also providing active focus and collimation control, introduce an interesting servo control problem. Misalignments between the center-of-gravity (CG), actuator, and sensor operating axes present nontrivial balancing requirements. This paper discusses a technique developed by Ball Aerospace Systems Group (BASG) to establish servo control of a magnetically suspended FSM (MSFSM). The process is dependant on the mirror's mass property matrix and two unknown coordinate transformations. The first is a CG-to-actuator (decoupling) transformation defined by statically balancing the actuator forces. The second is a sensor-to-CG transformation characterized by injecting noise into the system and compensating for off-axis cross coupling. Using this technique, BASG has developed a 5-inch MSFSM having 600 hertz closed 1oop bandwidth in the pointing axes and 50 hertz in the suspension axes.

Citation Download Citation

James D. Medbery and Avanindra A. Gupta "Stable controller design of a six-degree-of-freedom magnetically suspended fine-steering mirror", Proc. SPIE 1543, Active and Adaptive Optical Components, (13 January 1992); https://doi.org/10.1117/12.51188

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