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The reaction wheels provide small satellites with 3-axis control torques and 3-axis momentum exchange capability.

The integration of the reaction wheels with external gyroscopes enables 3-axis control of a spacecraft's inertial rates. The reaction wheels have high torque and high wheel momentum that make them useful for agile or larger small satellites.

Each reaction wheel has built-in electronics and software for controlling the wheel and gyroscope. The reaction wheels may be operated independently in current control or speed control modes, or their operation may be integrated with the gyroscopes to provide inertial rate control and inertial angle control modes.

FUNCTIONAL CHARACTERISTICS

Reaction Wheel (Hermetically sealed)
Nominal wheel torque 20 mNm
Nominal wheel momentum 0.65 Nms
Speed range -9000 to 9000 rpm
Rotor moment of inertia 1.0 x 10-3 kg.m2
Speed control tracking error < 1 rpm
Current consumption 40 mA / mNm
Measurement range 80 deg/s
Bias, full temperature range < 6 deg/hr
Bias, stabilised temperature < 3 deg/hr
Power consumption < 2 W
Inertial rate control tracking error< 0.05 deg/s

PHYSICAL CHARACTERISTICS

Reaction wheel
Mass 1550 g
Dimensions 102 x 102 x 105 mm
Static unbalance < 5 g.mm
Reaction wheel (100 rpm) 20 mA
Reaction wheel (4000 rpm) 120 mA
Operating temperature -30 to +60C

INTERFACES

Power supply 28 Volt
Data interfaces RS422 and SpaceWire

FEATURES

High wheel torque
High wheel momentum capacity
High accuracy speed control
High accuracy inertial rate control
(with addition of gyroscope)
Reaction wheel hermetically sealed
Built‐in electronics
Simple digital interface to satellite bus

APPLICATIONS

High performance 3-axis torque and momentum exchange actuators for agile small satellites
High accuracy inertial rate measurements for 3-axis stabilised satellites
Inertial rate control for accurate pointing of viewfinders and imagers

Click on the image to download the datasheet.



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Products	Reaction Wheel

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	Overview Technical Details Photo's Datasheet The reaction wheels provide small satellites with 3-axis control torques and 3-axis momentum exchange capability. The integration of the reaction wheels with external gyroscopes enables 3-axis control of a spacecraft's inertial rates. The reaction wheels have high torque and high wheel momentum that make them useful for agile or larger small satellites. Each reaction wheel has built-in electronics and software for controlling the wheel and gyroscope. The reaction wheels may be operated independently in current control or speed control modes, or their operation may be integrated with the gyroscopes to provide inertial rate control and inertial angle control modes. FUNCTIONAL CHARACTERISTICS Reaction Wheel (Hermetically sealed) Nominal wheel torque 20 mNm Nominal wheel momentum 0.65 Nms Speed range -9000 to 9000 rpm Rotor moment of inertia 1.0 x 10-3 kg.m2 Speed control tracking error < 1 rpm Current consumption 40 mA / mNm Measurement range 80 deg/s Bias, full temperature range < 6 deg/hr Bias, stabilised temperature < 3 deg/hr Power consumption < 2 W Inertial rate control tracking error< 0.05 deg/s PHYSICAL CHARACTERISTICS Reaction wheel Mass 1550 g Dimensions 102 x 102 x 105 mm Static unbalance < 5 g.mm Reaction wheel (100 rpm) 20 mA Reaction wheel (4000 rpm) 120 mA Operating temperature -30 to +60C INTERFACES Power supply 28 Volt Data interfaces RS422 and SpaceWire FEATURES High wheel torque High wheel momentum capacity High accuracy speed control High accuracy inertial rate control (with addition of gyroscope) Reaction wheel hermetically sealed Built‐in electronics Simple digital interface to satellite bus APPLICATIONS High performance 3-axis torque and momentum exchange actuators for agile small satellites High accuracy inertial rate measurements for 3-axis stabilised satellites Inertial rate control for accurate pointing of viewfinders and imagers Click on the image to download the datasheet.