Scan actuator subassembly
Abstract
A science platform drive system is being developed for the Galileo project to provide tracking and pointing motion for four scientific instruments. Galileo is a dual spin spacecraft to be launched in 1985 for a six year mission of interplanetary cruise and orbit around Jupiter. The platform drive being developed has many potential applications on other spacecraft and has been named the scan actuator subassembly. It provides accelerating torque up to 0.9 newton meter with a resolution of 0.03 percent. Rotor capacity is 70 kilograms and the unit, including control electronics, weighs 19.5 kilograms. A 16-bit optical encoder provides 20 arc seconds angular position resolution over the 210 degrees of angular freedom. A 200-lead flex-capsule provides electrical power and signal transfer across the rotating interface. This paper describes some of the unique features and problems encountered on this unit.
- Publication:
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In: Joint Automatic Control Conference
- Pub Date:
- 1981
- Bibcode:
- 1981jac.....2.....S
- Keywords:
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- Actuators;
- Galileo Spacecraft;
- Pointing Control Systems;
- Spacecraft Electronic Equipment;
- Spacecraft Instruments;
- Block Diagrams;
- Electric Motors;
- Instrument Packages;
- Torque;
- Spacecraft Instrumentation