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RSI 68 Momentum and Reaction Wheels

Features & Benefits

Power/loss torque optimized
Volume/mass optimized
Hermetically sealed
Modular configuration
Fast adaptation to customer requirements
Space qualified subsystems (rotor, motor, bearing unit and electronics)
Broad spectrum of different wheel types
For satellites weighing 1,500 to 5,000 kg
High reliability through heritage
Usable as a momentum or reaction wheel
More than 15 years of lifetime design

SpecificationsSpecifications

Performance

RSI 15-215/20

Angular Momentum at Nominal Speed	15 Nms
Operational Speed Range	± 2,000 rpm
Speed Limiter (EMF)	< 3,000 rpm
Motor Torque at Nominal Speed	215 mNm
Loss Torque	< 20 mNm
Imbalance
Static	< 1.5 gcm
Dynamic	< 20 gcm2

RSI 45-75/60

Angular Momentum at Nominal Speed	45 Nms
Operational Speed Range	± 6,000 rpm
Speed Limiter (EMF)	< 7,500 rpm
Motor Torque at Nominal Speed	75 mNm
Loss Torque	< 20 mNm
Imbalance
Static	< 1.5 gcm
Dynamic	< 20 gcm2

Physical Specs

Dimensions
Diameter	310 mm
Height	160 mm
Mass	< 7.7 kg

Power

RSI 15-215/20

Power Consumption
Steady state at nominal speed	< 15 W
Maximum torque at nominal speed	< 90 W
Power Interface
Supply voltage	21 to 37 VDC
Input current	< 4.5 A
Galvanic isolation between primary and secondary return	Yes
Preceeding stage	Yes
On/off relay	Yes
Signal Interface
Torque command and direction	Analog / bi-level
Speed measurement and direction	Analog / bi-level
Motor torque (current)	Analog
Bearing temperature	Analog (thermistor)
On/off status	Bi-level
On/off command	Pulses

RSI 45-75/60

Power Consumption
Steady state at nominal speed	< 22 W
Maximum torque at nominal speed	< 90 W
Power Interface
Supply voltage	21 to 37 VDC
Input current	< 4.5 A
Galvanic isolation between primary and secondary return	Yes
Preceeding stage	Yes
On/off relay	Yes
Signal Interface
Torque command and direction	Analog / bi-level
Speed measurement and direction	Analog / bi-level
Motor torque (current)	Analog
Bearing temperature	Analog (thermistor)
On/off status	Bi-level
On/off command	Pulses

Environmental

Environmental Conditions
Qualification/protoflight temperature	-25 to +70 °C
Operating temperature	-20 to +65 °C
Survival/non-operating temperature	-40 to +75 °C
Lifetime	> 15 years (in orbit)

Typical SystemTypical System

Main Components

Please contact Rockwell Collins for additional information on this product.

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Services & SupportServices & Support

Tailored Services

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