Space Robotics Encoders: Reliable Position Sensing in Orbit

VLS-60

The Netzer VLS-60 absolute rotary encoder delivers up to 22-bit resolution with accuracy reaching 0.01 Degree, all in an ultra-thin (<5.7 mm), lightweight (<16g) package. Designed for high-end space and cleanroom automation, its contactless capacitive technology ensures reliable, wear-free performance in precision positioning applications. The hollow, low-mass design supports seamless integration into satellite instruments, aerospace gimbals, and vacuum-compatible robotics, enhancing overall efficiency and accuracy.

The Netzer VLS family of lightweight, high-resolution rotary encoders is in active use across critical optical-communication programs, including APT, OISLs, FSO, DSOC, and ISLs. With exceptional repeatability and low inertia, VLS encoders deliver the deterministic feedback required for fine pointing, fast acquisition, and reliable tracking—ideal for satellites, terminals, and advanced photonics platforms.

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Features

COTS space-tested for mission-critical reliability
Outstanding accuracy in high-precision rotary feedback
Robust protection against EMI, RFI, and magnetic interference
Seamlessly integrates with innovative hollow shaft architecture
Optimized compact design for low-profile applications
Engineered for longevity in extreme temperature environments

Unique Values

Space tested
High precision
Immunity to Magnetic
MTBF 15

OD

59.7 mm
ID

25 mm
Height

5.7 mm
Weight

16 gr
Resolution

17-22 bit
Accuracy

±0.010°˚

Technical Data

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General

Angular resolution 17-22 bit
Nominal position accuracy ±0.010°
Repeatability 1.4 mdeg / 4.9 Arcsec
Maximum operational speed 4,000 rpm
Measurement range Single Turn Absolute with optional shaft turn counter
Built In Test BIT Optional
Rotation direction Adjustable CW/CCW (Default same direction from bottom side of the encoder)

Mechanical

Allowable mounting eccentricity ±0.1 mm
Allowable axial mounting tolerance ±0.2 mm
Rotor inertia 2,000 gr · mm²
Total weight 16 gr
Outer Ø /Inner Ø / Height 59.7 / 25 / 5.7 mm
Material (stator / rotor) Polyimide
Nominal air gap (stator, rotor) 0.6 mm

Electrical

Supply voltage 5V ±5%
Current consumption ~90 mA
Interconnection Cable (standard 250mm)
Communication SSi / BiSS-C
Output code Binary
Serial output Differential RS-422
Clock frequency 0.1- 5.0 MHz
Position update rate 35 kHz (Optional - up to 375 kHz)

Environmental

EMC IEC 6100-6-2, IEC 6100-6-4
Operating temperature range -40°C to +105°C (Optional -55°C to +125°C)
Storage temperature -55°C to +125°C
Relative humidity 98% Non condensing
Shock endurance / functional 100g 6msec saw-tooth per IEC 60068-2-27:2009 40g 11msec saw-tooth per MIL-810G
Vibration functional 7.7grms @ 20 to 2000 Hz per MIL-810G Category 24
Protection Parylene conformal coating: improved low outgassing, reduces Tin Whiskers risk.
Low out-gassing TML < 1%, CVCM < 0.1%
Radiation tested for TID = 30KRAD. SEE 1E11 p/cm²/s protons @200MeV

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OD
- 25 mm (ID - 2.2 mm)
- 59.7 mm (ID - 25 mm)
- 80 mm (ID - 35 mm)
- 100 mm (ID - 48 mm)
- 140 mm (ID - 90 mm)
- 170 mm (ID - 110 mm)
- 247.7 mm (ID - 171.4 mm)
Communication
- BiSS
- SSi
Resolution
- 17 bit
- 18 bit
- 19 bit
- 20 bit
- 21 bit
- 22 bit
- 23 bit
BIT
- Disabled
- Enabled
Shaft-turn Counter
- 2,048
- 4,096
- 8,192
- 16,384
- 32,768
- None
Cable Type
- Jacket and shielded cable
- Shielded cable
- Wires only
- ESA Space Cable
Cable Length
- 250 mm Flying leads - 28AWG
- 500 mm Flying leads - 28AWG
- 750 mm Flying leads - 28AWG
- 1000 mm Flying leads - 28AWG
Rotor Type
- Hollow Shaft Encoder
- End Shaft - Single Screw VL25
- Shaft with Insert
Custom
- High Temperature