PAGE CONTENTS
Objectives
Since 1997 Astro- und Feinwerktechnik Adlershof GmbH has developed a family of reaction wheels for small satellites. The objective of this activity is to develop a High Momentum Wheel for telecommunication satellites. It provides a 100 Nms momentum capacity and an output torque of 0.2 Nm. Furthermore, it offers a digital interface with an embedded closed loop controller for higher accuracy and torque stability.
Challenges
-
Design to cost, using radiation tolerant automotive grade EEE parts
-
Design for serial production according to industrial standards
-
Development and qualification within 3 years
-
Equipment mass of 12.5 kg
-
Extended bearing life time for more than 15 years in GEO
System Architecture
The reaction wheel is a fully integrated device, consisting of the reaction wheel assembly (including flywheel, chassis and housing) and the wheel drive electronics (including motor, sensors).
Plan
The project plan comprised a Development Phase that was completed until Mid of 2023. Until the end of 2023 the Qualification was completed. In early 2024 the first flight sets delivery has been started.
Current Status
At the beginning the requirements database has been defined and established. Beginning with the functional description and the definition of the functional chain first breadboard models have been developed. Within the further RW6000 development program EM1 and EM2 have been built to justify proper form, fit and function of the RW6000.
Three EQMs and 1 EM have been built in parallel to expedite the development and qualification program of the RW6000. The EM has been run through full EMC/ESD qualification campaign. EQM2 and EQM3 have been used for life testing in order to justify the mechanical design including the ball bearing unit. EQM1 has been run through a complete qualification test campaign including vibration, pyroshock and thermal-vacuum testing of the full flight representative unit. All tests have been supported by several function and performance tests as well as microvibration characterization prior, in between and after the test activities.
It can be considered that all planned test have been successful and the RW6000 is to be considered as qualified with TRL 7 and will reach TRL 8 after successful PFM/FM acceptance tests.
Activity is complete.
