Aeronautics and astronautics – Spacecraft – Attitude control
Patent
1988-09-12
1990-10-02
Barefoot, Galen
Aeronautics and astronautics
Spacecraft
Attitude control
244165, B64G 124
Patent
active
049602500
ABSTRACT:
In an attitude control system for a spacecraft having a frame which is to be maintained in a desired orientation relative to a selected set of reference axes, which system includes an electromechanical actuator mechanically coupled to the spacecraft frame for applying to the frame a mechanical torque which opposes deviations from the desired orientation relative to at least one reference coordinate, the actuator including an electric motor and an element connected to be rotated by the motor, and a torque command signal generator connected to the motor for applying a torque command signal which is a function of such deviations and which drives the motor in a manner to control the torque being produced by the actuator, there is included an energy desaturating system composed of: a unit coupled to the element for producing a signal representative of element motion; a signal modifying circuit connected to produce a control signal having a magnitude which is a function of the signal representative of element motion; and signal coupling components including a switch connected for applying the control signal to the actuator with a polarity for effecting actuator desaturation only during the times that the switch is closed.
REFERENCES:
patent: 3493194 (1970-02-01), Kurzhals
patent: 3813067 (1974-05-01), Mork
patent: 3998409 (1976-12-01), Pistiner
patent: 4010921 (1977-03-01), Pistiner et al.
patent: 4230294 (1980-10-01), Pistiner
patent: 4728061 (1988-03-01), Johnson et al.
NASA Technical Memorandum X-53748, "Angular Momentum Desaturation for ATM Cluster Configuration Using Gravity Gradient Torques", Hans F. Kennel, Marshal Space Flight Center, Alabama, 1970.
Barefoot Galen
Space Industries Partnership, L.P.
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