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Research Papers

Magnetically Suspended VSCMGs for Simultaneous Attitude Control and Power Transfer IPAC Service

[+] Author and Article Information
Junyoung Park

Department of Mechanical Engineering, Vibration Control and Electromechanics Laboratory, Texas A&M University, MS 3123, College Station, TX 77843-3123jy1029.park@samsung.com

Alan Palazzolo

Department of Mechanical Engineering, Vibration Control and Electromechanics Laboratory, Texas A&M University, MS 3123, College Station, TX 77843-3123a-palazzolo@tamu.edu

J. Dyn. Sys., Meas., Control 132(5), 051001 (Aug 11, 2010) (15 pages) doi:10.1115/1.4002105 History: Received July 09, 2008; Revised April 28, 2010; Published August 11, 2010; Online August 11, 2010

This paper presents the theory and numerical results of utilizing four gimbaled, magnetically suspended, variable speed flywheels for simultaneous satellite attitude control and power transfer (charge, storage, and delivery). Previous variable speed control moment gyro models and control algorithms assumed that the flywheel bearings were rigid. However, high speed flywheels on spacecraft will be supported by active magnetic bearings, which have flexibility and in general frequency dependent characteristics. The present work provides the theory for modeling the satellite and flywheel systems including controllers for stable magnetic bearing suspension for power transfer to and from the flywheels and for attitude control of the satellite. A major reason for utilizing flexible bearings is to isolate the imbalance disturbance forces from the flywheel to the satellite. This g-jitter vibration could interfere with the operation of sensitive onboard instrumentation. A special control approach is employed for the magnetic bearings to reject the imbalance disturbances. The stability, robustness, tracking, and disturbance rejection performances of the feedback control laws are demonstrated with a satellite simulation that includes initial attitude error, system modeling error, and flywheel imbalance disturbance.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Coordinate systems and one VSCMG module

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Figure 2

Typical five axes MB suspension system

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Figure 3

First-order representation of PWM

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Figure 4

C-core electromagnet and rotor lamination stack

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Figure 5

Equivalent magnetic circuit

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Figure 6

MB feedback control loop diagram

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Figure 7

IPAC system feedback control loop

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Figure 8

Four MB suspended VSCMGs in a pyramid configuration

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Figure 9

Details of a magnetically suspended VSCMG module

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Figure 10

Satellite reference motions

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Figure 11

Satellite actual motions

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Figure 12

Velocity and attitude error vectors

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Flywheel RPMs and motor torques

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Figure 15

Flywheel transverse velocities

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Flywheel displacements at sensor position

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Figure 17

Magnetic bearing forces

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Figure 18

Power transfer time histories

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Figure 19

Determinant and weights factor

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Figure 20

Satellite reference motions

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Figure 21

Satellite actual motions

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Figure 22

Velocity and attitude error vectors

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Figure 24

Flywheel RPMs and motor torque

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Figure 25

Flywheel transverse velocities

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Figure 26

Flywheel displacements at sensor position

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Figure 27

Magnetic bearing forces

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Figure 28

Power transfer motion

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Figure 29

Determinant and weights factor

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Figure 30

Flywheel displacements at sensor position and magnetic bearing force (case 1)

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Figure 31

Flywheel displacements at sensor position and magnetic bearing force (case 2)

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Figure 32

The effect of gimbal axis uncertainty with bearing stiffness 1.03×105 N/m

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