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Deployment Mechanisms

Solar Array Deployment Mechanism

RUAG Space has developed the deployment mechanism for the Hubble Space Telescope Solar Array:

  • 90 ° Rotation of Solar Array
  • Redundant motor drive with astronaut override
  • Self locking in deployed position
  • Operating conditions -40 ° C to + 65 ° C
  • Re-stowable with motor drive
  • Astronaut release and attachment mechanism for in-orbit replacement

The base concept of our commercial hinge device including latching system was developed for the successfully flown ECS and Skynet-IV solar arrays.

  • Very high stiffness at low mass
  • Self locking latches
  • Sophisticated synchronisation
  • High reliability
  • High frequency

Further commercial references are IMMARSAT, HIPPARCOS, EURECA, Telecom II, HISPASAT, INTEGRAL, METOP, ATV

Eddy Current Damper

  • Mass: 750 grams
  • Damping Rate: max limit is 1,500 Nm.sec/rad - min limit is 600 Nm.sec/rad.
  • Maximum Torque: 79 +/-5%
  • Max Allowable Start-up Torque: 1.2 Nm
  • Temperature: cold operation temperature of -55ºC

Viscous Deployment Damper

  • Mass: 230 g
  • Deployment Angle: 90° nominal (270° on request)
  • Overall Flange Diameter: 63 mm
  • Overall Length: 81 mm
  • Housing Diameter: 50 mm
  • Working fluid: Silicone Oil Baysilone M 100000
  • Damper Characteristics (other values selectable):
    -30 ° C: 1,43 x10 3 Nms/rad
    +25 ° C: 337 Nms/rad
    +50 ° C: 212 Nms/rad
  • Resistive torque: 0.09 Nm (=Break-away torque)
  • Temperature range survival: -150 °C / +150 °C
  • Temperature range operation: -30 °C/+50 °C
  • Leak rate: space environment 3 x 10-9 g/s
  • Life time in space: 15 years

Deployment Mechanism for Large Appendage

RUAG Space has developed and qualified a spring driven, non-reversible Deployment System for Large Appendages, which is focusing on high position accuracy and stiffness in the deployed configuration. In addition, it also provides an integrated deployment damper to eliminate the end position latching shock.
This Deployment System is intended for the deployment of large appendages such as large Reflector Antennas or Solar Arrays.

  • Locking mechanism to provide high position accuracy and stiffness in the deployed configuration
  • Angular contact ball bearing in O-arrangement
  • Dimensions: 122 mm x 110 mm x 70 mm
  • Mass: 1500 g
  • Deployment range: up to 180°
  • Torque: 4 Nm - 10 Nm
  • Stiffness:
  • axial stiffness 1,7 x 107 N/m
  • min. radial stiffness 2,7 x 104 Nm/Rad
  • axial rotation stiffness 2,3 x 104 Nm/Rad (up to 6,1 x 104 Nm/Rad)
  • Resistive Torque: 0,2 Nm
  • Temperature range survival: -150 °C / +150 °C
  • Temperature range operation: -30 °C / +50 °C

Antenna Deployment and Pointing Mechanisms

TypePerformanceMass (kg)Mission / Application
SARA210.00625 °1.8Spacebus, SmallGeo
CSA100.0021 °2.0SMART-1 TOM, SEPTA33
CSA1000.005 °5.2 

Sealed Brush Gear Motor

 

The Sealed Brush Gear Motor (SBGM) is mainly dedicated as in orbit motion control and actuation mechanism for solar array panels. But the SBGM can also be used for other applications where a robust, simple and space qualified actuator is needed. The SBGM mechanism can be operated in motor and generator (brake) mode. No complex electronic controller is needed.