The Serenum Space RW25 CubeSat Reaction Wheel is designed for 1U to 6U sized CubeSat missions. Some of its key features include fine pointing maneuvers, advanced attitude control including freeze mode, and low vibration design. It is mainly suitable for earth observation missions.

Key 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
  • 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

Flight heritage

The system has acheived flight heritage.

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Last updated: 2022-10-20

RW25 CubeSat Reaction Wheel



lead time
12 wk
40 g
25 mm
25 mm
25 mm
idle power
75 to 100 mW
peak power1
300 to 400 mW
power consumption2
300 mW (Typ.)
power rail
3.3 V
radiation tolerance
36 krad
speed range
± 5600 rpm
dynamic imbalance
< 0.006 g cm
static imbalance
< 0.003 g cm
maximum torque
0.200 mN m
total momentum storage
0.600 mN m s

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

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


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