Pivoted wheel roll control with automatic offset

Details Pivoted wheel roll control with automatic offset Pivoted wheel roll control with automatic offset

1992-07-30

1994-10-11

Huppert, Michael S.

Aeronautics and astronautics

Spacecraft

Attitude control

244164, 244166, 244171, B64G 132

Patent

active

053540166

ABSTRACT:
A 3-axis stabilized spacecraft includes roll and yaw magnetic torquers, and a momentum wheel oriented with its spin axis orthogonal to, and pivotable about, the roll axis. Roll control may be applied by pivoting the wheel. Secular increases in pivot angle may result in loss of control authority when the mechanical limits of the pivot are reached. The pivot angle is sensed, and an unloading control loop is closed, by which magnetic torquers are energized to torque the spacecraft, to return the pivot angle toward zero. The unloading control loop includes a bandpass filter, which eliminates constant components of pivot angle offset. This prevents the unload control loop from attempting to maintain the pivot at a position in which the wheel axis is offset from the desired normal to the orbit plane. Consequently, the magnetic torquers do not expend system energy attempting to maintain an undesirable attitude.

REFERENCES:
patent: 3813067 (1974-05-01), Mork
patent: 5259577 (1993-11-01), Achkar et al.

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