Miniature Reaction and Momentum Wheels for Nanosatellites and Microsatellites

We manufacture 3-axis Miniature Reaction Wheels (MRW) in a hermetically sealed enclosures. The IMI-101 suitable for up to about 20 lb Nanosatellite applications requiring precise 3-axis pointing such as is required for Earth imaging or Celestial pointing. The IMI-201 is a variant of the IMI-101 intended for larger spacecraft (up to about 50 lbs). It achieves higher control authority by use of high speed motors.  The IMI-201 will be available 4Q07.

The IMI-101 is a 3-axis Miniature Reaction Wheel (MRW) in a hermetically sealed 3”x 3”x
2.75” enclosure. It is suitable for up to about 20lbs Nanosatellite applications requiring precise 3-axis pointing such as is required for Earth imaging or Celestial pointing. The IMI-201 is a variant of the IMI-101 intended for larger spacecraft (up to about 50 lbs). It achieves higher control authority by use of high speed motors. The IMI-201 will be available 4Q07.

Torque and momentum storage have been sized for a micro or nano-spacecraft in a high agility application. For example, the IMI-101 can slew an Earth imaging CubeSat size spacecraft to rapidly retarget between successive aim points, each located ±30° off track.

IMI-101 Specifications

Mechanical Interface

For mounting IMI-101 an interface plate can be supplied. This is shown below.

The IMI-201 is a 3-axis Miniature Reaction Wheel (MRW) in a hermetically sealed 3”x 3”x 3”
enclosure. It is suitable for up to about 50lbs Nanosatellite applications requiring precise 3-axis pointing such as is required for Earth imaging or Celestial pointing. The IMI-201 is a variant of the IMI-101. Using the same size package, it achieves higher control authority by use of high speed motors. The IMI-201 will be available 4Q07.

IMI-101 Flight Units to be flown on CuSAT in 2009 Typical Nanosat Application
The IMI-200™ is an enhanced version of the IMI-201 which incorporates full Attitude
Determination and Control Capability in a single package. It includes electromagnets,
magnetometer, earth, and sun sensors as well as a fully programmed ADACS computer. The
IMI-200 will be available in 1Q08.

IMI-201 Specifications