Closed-loop performance of a six degree-of-freedom precision magnetic actuator

Zhaohui Ren; Lyndon S. Stephens

doi:10.1109/TMECH.2005.859823

Closed-loop performance of a six degree-of-freedom precision magnetic actuator

Zhaohui Ren, Lyndon S. Stephens

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

The slotless permanent-magnet self-bearing motor (SBM) technology is used to fully provide radial bearing and motoring functionality simultaneously in a six degree-of-freedom magnetic actuator for potential precision pointing and tracking applications in space such as intersatellite laser communications. This novel precision magnetic actuator incorporates two SBMs to produce both radial bearing forces and motoring torque, and one active magnetic bearing to provide axial support, and thus allows for a complete eleetromagnetic suspension and precision noncontact pointing. An analytical representation of the overall dynamic system is presented for controller design. Six decoupled proportional-integral-derivative controllers are designed, and a feedback control system is implemented. The closed-loop performance confirms experimentally that the precision magnetie actuator is capable of smooth angular slewing while maintaining good stabilization. The most encouraging result is that the actuator achieves a high angular resolution of 754 nrad over a large azimuth range of ±45°.

Original language	English
Pages (from-to)	666-674
Number of pages	9
Journal	IEEE/ASME Transactions on Mechatronics
Volume	10
Issue number	6
DOIs	https://doi.org/10.1109/TMECH.2005.859823
State	Published - Dec 2005

Bibliographical note

Funding Information:
Manuscript received May 30, 2005; revised August 16, 2005. This work was supported in part by Airex Corporation, Dover, NH. Z. Ren was with the Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506 USA. She is now with Mohawk Innovative Technology, Inc., Albany, NY 12205 USA (e-mail: zh [email protected]). L. S. Stephens is with the Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506 USA (e-mail: [email protected]). Digital Object Identifier 10.1109/TMECH.2005.859823

Keywords

Active magnetic bearing (AMB)
Laser communication
Permanent-magnet (PM) self-bearing motor (SBM)
Precision pointing and tracking

ASJC Scopus subject areas

Control and Systems Engineering
Computer Science Applications
Electrical and Electronic Engineering

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10.1109/TMECH.2005.859823

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abstract = "The slotless permanent-magnet self-bearing motor (SBM) technology is used to fully provide radial bearing and motoring functionality simultaneously in a six degree-of-freedom magnetic actuator for potential precision pointing and tracking applications in space such as intersatellite laser communications. This novel precision magnetic actuator incorporates two SBMs to produce both radial bearing forces and motoring torque, and one active magnetic bearing to provide axial support, and thus allows for a complete eleetromagnetic suspension and precision noncontact pointing. An analytical representation of the overall dynamic system is presented for controller design. Six decoupled proportional-integral-derivative controllers are designed, and a feedback control system is implemented. The closed-loop performance confirms experimentally that the precision magnetie actuator is capable of smooth angular slewing while maintaining good stabilization. The most encouraging result is that the actuator achieves a high angular resolution of 754 nrad over a large azimuth range of ±45°.",

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N2 - The slotless permanent-magnet self-bearing motor (SBM) technology is used to fully provide radial bearing and motoring functionality simultaneously in a six degree-of-freedom magnetic actuator for potential precision pointing and tracking applications in space such as intersatellite laser communications. This novel precision magnetic actuator incorporates two SBMs to produce both radial bearing forces and motoring torque, and one active magnetic bearing to provide axial support, and thus allows for a complete eleetromagnetic suspension and precision noncontact pointing. An analytical representation of the overall dynamic system is presented for controller design. Six decoupled proportional-integral-derivative controllers are designed, and a feedback control system is implemented. The closed-loop performance confirms experimentally that the precision magnetie actuator is capable of smooth angular slewing while maintaining good stabilization. The most encouraging result is that the actuator achieves a high angular resolution of 754 nrad over a large azimuth range of ±45°.

AB - The slotless permanent-magnet self-bearing motor (SBM) technology is used to fully provide radial bearing and motoring functionality simultaneously in a six degree-of-freedom magnetic actuator for potential precision pointing and tracking applications in space such as intersatellite laser communications. This novel precision magnetic actuator incorporates two SBMs to produce both radial bearing forces and motoring torque, and one active magnetic bearing to provide axial support, and thus allows for a complete eleetromagnetic suspension and precision noncontact pointing. An analytical representation of the overall dynamic system is presented for controller design. Six decoupled proportional-integral-derivative controllers are designed, and a feedback control system is implemented. The closed-loop performance confirms experimentally that the precision magnetie actuator is capable of smooth angular slewing while maintaining good stabilization. The most encouraging result is that the actuator achieves a high angular resolution of 754 nrad over a large azimuth range of ±45°.

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Closed-loop performance of a six degree-of-freedom precision magnetic actuator

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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