MicroWheel 200 (MW200) Reaction Wheel

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MicroWheel 200 (MW200) Reaction Wheel

DESCRIPTION

MSCI is proud of the extensive flight heritage our world-leading MicroWheel 200 (MW 200 Reaction Wheel) has gained – more than 47 years of operational wheel-hours in LEO orbit on three separate missions.

The MW 200, part of MSCI’s High Performance Attitude Control product line, is a small, digitally controlled reaction wheel for space applications. The 200-series MicroWheel is for satellites requiring less than 200 mNms of momentum storage. It can include an optional angular rate sensor, to allow the device to become a sensor/actuator pair. An embedded microcontroller operates both the reaction wheel and optional rate sensor. The microcontroller implements speed and torque control loops for the reaction wheel, allowing it to accurately track speed or torque commands from a satellite’s attitude control computer. Commands and telemetry (including wheel speed, acceleration, torque, rate sensor reading, temperature, voltage, current, and internal pressure) are communicated via a serial interface.

The MicroWheel reaction wheel is hermetically sealed, containing a <0.1 ATM dry argon environment, to prevent the loss of bearing lubricant, and to promote convective heat exchange.

BENEFITS

MSCI's MW 200 MicroWheels provide a simple, drop-in solution to satellite control. With their serial data interface, the MicroWheels perform all motor control tasks internally to generate precisely the torque requested by the Attitude Control System (ACS) computer.

CAPABILITIES

The MW 200’s key capabilities include: · Spaceflight-proven design · Low power consumption · All-in-one control and navigation solution (with optional rate sensor)

SPECIFICATIONS

Size: 100 x 90 x 90 mm

Mass: < 1.0 kg (optional angular rate sensor included)

Material: Aluminum 6061T6 with a SurTec 650 ChromitAL TCP (MIL-DTL-81706 2 B Type II, Class 3) coating.Speed range: +/-10,000 RPM

Angular momentum capacity: 0.18 Nms

Torque capacity: 30 mNm

Data interfaces available: asynchronous RS-422/485 serial ports

Power consumption (at 25C, zero torque):

0 RPM: < 2.0 W
10 000 RPM: < 7 W
+ 1W for optional rate sensor

Voltage: one unregulated power line (28V +/- 6 V)

Temperature range: -30/+60C (Operational), -35C/+65C (Ground Storage)

Torque control mode performance: < +/- 50 uNm (1-sigma over 10 seconds)

MEMS Rate Sensor Performance:

Ranges from 2 to 500 deg/sec
Uncalibrated drift rate < 0.35 deg/sec

Commands: speed or torque set-points, 20 Hz command rate achievable

Telemetry: wheel speed, acceleration, torque, angular rate, pressure, temperatures, voltages,

Design Life: 5 years

QUALIFICATION

Qualification testing complete; flight units delivered for multiple programs.

For more information, download the MicroWheel 200 Product Brochure.

PRODUCT ASSURANCE

MSCI’s Product Assurance program ensures that appropriate quality requirements are established and achieved throughout the design, procurement, fabrication, assembly, inspection, testing, storing, shipping and handling phases of the program. Implementation of the quality requirements ensures prompt detection of deficient or marginal quality and effective corrective action.

Please click here to see more details on MSCI’s Product Assurance program.

WORKMANSHIP STANDARDS

Workmanship standards are employed throughout all phases of manufacturing, assembly and integration to control the quality of the operation. Standards identify specific acceptance/rejection criteria and are maintained to meet current requirements. Samples or visual aids required to verify acceptable workmanship are subject to review by QA. Please click here to see a list of the workmanship standards that are used at MSCI.

Like to know more? Please contact us at info@mscinc.ca

We are proud of our outstanding flight heritage that continues to exceed all expectations. It is a testament to the quality of the minds at MSCI and to the excellence of their creations. > more