Reaction wheels

Availability: 12 weeks

Hardware

  • BLDC motor with 3 integrated Hall sensors
  • ARM Cortex-M0+ microcontroller (24 MHz)
  • 6-axis Inertial Measurement Unit (3-axis accelerometer, 3-axis gyroscope)


Interfaces

  • I2C or UART communication interface (runtime configurable)
  • CubeSat Space Protocol support 


Summary

The capability of performing extremely fine pointing maneuvers, high position accuracy, advanced attitude control including freeze mode, low vibration design and high energy efficiency make these Reaction Wheels ideal for low-GSD Earth observation CubeSat missions on 1U - 3U sized platforms.


Highlighted Features

Speed or torque control mode

Motor control optimized for low power usage

Fully automatic single-axis freeze mode

Wide range of self-diagnostic tools, including:

  • current/voltage monitoring
  • configurable software overcurrent protection
  • automated motor performance evaluation
  • in-orbit power consumption optimization

Improved radiation hardness features, including:

  • ECC non-volatile memory
  • radiation damage detection in all memory banks

Several degrees of redundancy within motor sensors and the possibility to run completely sensorless

Designed to reduce imbalance of the rotating parts

Low noise generation

Low-drift 3-axis gyroscope with built-in high-resolution temperature sensor

Runtime configurable I2C or UART communication interface with CSP support

5 or 8 V variants


Absolute maximum ratings

Stress above those listed as “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these conditions is not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.

Power railMin. Max.
Unit
3.3V-0.34.0V
PWR-0.311.0V

Electrical characteristics

Power consumptionTyp.Max.Unit
Idle75100mW
Active1300400mW

Physical characteristics

CharacteristicsValueUnit
Mass40
g
Dimensions25x25x25 mm
Radiation tolerance36krad
Radiation tolerance< 0.003g∙cm
Dynamic imbalance< 0.006g∙cm

The envelope dimensions were chosen so that the full three-axis reaction wheel actuator system can fit comfortably within a 1U CubeSat.


Performance characteristics

CharacteristicsValueUnit
Speed range± 5600RPM
Maximum torque0.200mN∙m
Total momentum storage0.600mN∙m∙s


1. BOL at maximum RPM, when using default amplitude model. Performance with customized and self-measured amplitude models may vary.





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