Electromagnetic Unit (EMU) – Magnetic Torquer
Glavkosmos
The Electromagnetic Unit (EMU) is a magnetic torquer designed for spacecraft attitude control systems, creating a dipole magnetic moment proportional to the current flowing through its two independent windings. It is used for orientation and unloading reaction wheels in low, medium, and geostationar
Key figurescomparable across the catalogue
- Mass
- 0.48 kg
- Power
- 2 W
- Largest dimension
- 345 mm
- Design life
- 5 years
- Lead time
- 6 months
Normalised to common units so this product can be compared with others in its category. The supplier's own wording is below.
As published by the supplier
- Year of release
- 2016
- Design life
- 5 years
- Lead time
- 6 months
- Flight qualification of the product
- No
- Brief history of flight qualification
- Flight tests, normal operation.
- Possibility to adapt the product to customer requirements
- Yes
- Working orbits
- Low, medium and geostationary orbits
- Mass of emu
- 0.48 kg
- Magnetic moment
- ≥ 20 A·m² throughout the operating temperature range
- Residual magnetic moment
- ≤ 0.05 A·m²
- Number of windings
- 2
- Power supply voltage
- 4.5 ± 0.1 V
- Power consumption
- ≤ 2 W
- Operating temperature range
- from -20 to + 55 °C
- Overall dimensions
- Ø17 × 345 mm
About
The Electromagnetic Unit (EMU) – Magnetic Torquer is a critical component for spacecraft attitude control systems. Its primary purpose is to generate a dipole magnetic moment, the value of which is directly proportional to the current flowing through its two independent windings. This functionality is essential for the orientation of spacecraft and for the unloading of reaction wheels, ensuring stable and precise attitude control in various orbital environments. The EMU was released in 2016 and boasts a guaranteed service life of 5 years. While it does not have formal flight qualification, it has undergone flight tests and demonstrated normal operation. The manufacturer offers the possibility to adapt the product to customer requirements, including developing and supplying EMUs with magnetic moments ranging from 0.2 to 800 A·m². It is designed to operate in low, medium, and geostationary orbits. Key specifications include a mass of 0.48 kg, a magnetic moment of ≥ 20 A·m² throughout the operating temperature range, and a residual magnetic moment of ≤ 0.05 A·m². It features two windings, operates on a power supply voltage of 4.5 ± 0.1 V, and has a power consumption of ≤ 2 W. The operating temperature range is from -20 to +55 °С, and its overall dimensions are Ø17 x 345 mm. Estimated production and delivery time is 6 months.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.