Space robotics and mechanisms Angular encoders
Hollow shaft
Contactless angular encoders can be used for robotic joints or mechanisms. A ring with a magnetized code can be attached to a shaft or a ferromagnetic tooth / drill hole pattern can be implemented directly on the shaft on customer side.
- Radiation hard >100 krad
- Measurement uncertainty 0.1° to 1°
- Repeatability 0.01° to 0.001°
- Contactless
- Incremental or absolute measurement
End of shaft
End of shaft solutions offer an absolute, cost-effective, contactless measurement over 2x 180°.
Performance:
- Radiation hard >100 krad
- Measurement uncertainty 0.1° to 1°
- Repeatability
- Contactless
Hollow shaft solutions
MR sensor solutions can operate in extreme radiation and temperature environments including the Martian winter. For applications where higher precision is required, Sensitec offers sensor solutions for hollow-shaft assemblies. An analog incremental solution only requires 2 ADC channels on the customer side and the implementation of a simple trigonometric function or table-look up inside the motor control. The analog incremental solution can be extended with a reference sensor to provide a reference information once per revolution.
Incremental Encoder Performance
- 360°
- Repeatability / resolution <0.01°
- Radiation hard >100 krad
- Contactless
Interface
- One differential sine / cosine analog signal period per magnetic pole
- Rectangular shaped PCB for arbitrary pole ring sizes
The absolute sensor solution requires a 2 channel ADC on the customer side as well as 8-12 digital input channels. The number of digital channels can be reduced by multiplexing if required.
Absolute Encoder Performance
- 360° absolute true-power on
- Repeatability / resolution <0.01°
- Radiation hard >100 krad
- Contactless
- Compensation of radial run-out possible
Interface
- One differential sine / cosine analog signal period per magnetic pole
- 8-12 digital channels
- Ring-shaped PCB
Signal Processing Box (for evaluation purposes)
For evaluation purposes, Sensitec also offers a signal-processing box, which allows testing and evaluation on ground. The box provides a digital output signal of the angular position
- Converts Absolute encoder signals to digital position signal
- Output though UART or SPI
Coming soon
End of shaft solutions
End of shaft solutions offer the most compact solution. A dipole magnet is attached to the end of a shaft. A sensor module with a sensor chip and amplification is placed above the rotating shaft at a distance, which depends on the size and strength of the magnet.
The electric interface provides a sine / cosine signal, which allows the calculation of an absolute, position over 2x 180° through an atan2 function.
Absolute Encoder Performance
- 2x 180° absolute true-power on
- Repeatability / resolution <0.1°
- Radiation hard >100krad
- Contactless
- Low sensitivity to radial run-out
Interface
One differential sine / cosine analog signal period per magnetic pole
Trade space
| Sensor Solution | Repeatability | Range | Absolute on power-on | Interface | Radial run-out tolerance | Power |
|---|---|---|---|---|---|---|
| End of shaft | <0.1 | 2x 180° | Yes | 2 analog channels | High | <0.1 W |
| Hollow shaft incremental | 0.01° to 0.001° | 360° | No | 2 analog channels | Low / high with redundant module | <0.1 W |
| Hollow shaft absolute | 0.01° to 0.001° | 360° | Yes | 2 analog channels, 8-12 digital channels | High | <0.2 W |
Our sales team.
Find your contact!
We provide personal advice and support by a sales employee responsible for you. We help you choose the optimal solution for your application and answer any questions about the products. We are happy to submit an individual offer to you.
