Magnetic encoder are widely used in position sensing, motion control, and industrial automation.
The most typical application currently is in the joints of robots, which requires precision motion positioning and minimal installation space.
Key manufacturers of chips and products series include:
IC-Haus:
MU Series (e.g., MU150, MU200, MU128)
MA/ME Series (e.g., MA302, ME160)
AMS :
AS504x (e.g., AS5045, AS5048)
AS5x47 (e.g., AS5147, AS5247)
Melexis:
MLX90316
Here we list some major characters of different magnet encoder ASICs:
| Feature | IC-Haus (MU200) | AMS (AS5048) | Melexis(MLX90316) |
| Resolution | 17-bit | 14-bit | 12-bit |
| Interface | BiSS-C, SPI, analog | I2C, PWM | Analog/PWM |
| Temp. Range | -40°C to +125°C | -40°C to +150°C | -40°C to +150°C |
| Key Advantage | High-speed, programmability | Low power consumption | Linear/rotary versatility |
Encoder discs or called encoder target are used to work with ASICs as magnet target. Higher resolution of the encoder requires the encoder disc with precise magnetic pole size and magnetic field strength.
For instance, here is the requirement of MU200 on the encoder disc(MU200 is designed for advanced applications requiring higher precision, speed, and digital communication):
- 2-Track nonius encoder disc, bipolar magnetized.
- Number of pole pairs: master 32, nonius 31.
- Temperature Coefficient of the Remanence : -0.19%/K.
OBT solutions for 2 Track nonius encoder disc
OBT Rubber Seal specializes in providing customized 2 Track nonius encoder disc which could work with a wide range of motion control systems.
These encoder discs are produced as combination of ferromagnetic rubber and metal.Here is the rough production process diagram of encoder disc：
Here is our 2 Track nonius encoder discs which could work with IC HAUS MU200:
 |  |
| Number of pole pairs on master track | Number of pole pairs on Nonius track | ID2 | 0D2 | Diameter of master track | Diameter of Nonius track | Pole width of master track | Pole width of Nonius track |
| 32 | 31 | 25mm | 44.5mm | 40.8mm | 32.8mm | 2mm | 1.66mm |
| 64 | 63 | 62mm | 85mm | 81.5mm | 73.5mm | 2mm | 1.83mm |
Remark: Remanence @20°C : 200mT
By increasing the number of pole pairs of dual track disks that match the chip, the resolution of the encoder can be improved. If the IC HAUS MU200 chip adopts 64/63 polarity, the resolution can be further improved to 20 bits.
Here is the 2 Track nonius encoder discs which could work with IC MU150 and IC MU128:
| MU150 | |||||||
| Number of pole pairs on master track | Number of pole pairs on Nonius track | ID2 | 0D2 | Diameter of master track | Diameter of Nonius track | Pole width of master track | Pole width of Nonius track |
| 64 | 63 | 47 | 65 | 61 | 54 | 1.5 | 1.34 |
| 32 | 31 | 18 | 34.5 | 30.6 | 23.4 | 1.5 | 1.34 |
| MU128 | |||||||
| Number of pole pairs on master track | Number of pole pairs on Nonius track | ID2 | 0D2 | Diameter of master track | Diameter of Nonius track | Pole width of master track | Pole width of Nonius track |
| 64 | 63 | 38 | 56 | 52.2 | 45 | 1.28 | 1.12 |
| 32 | 31 | 15 | 29 | 26 | 18.88 | 1.28 | 1.12 |
Assembly: The encoder disc can be assembled on the bracket with adhesive or screw fastening. And we can also customize and develop an integrated design that matches the assembly enviroment for you.
Thanks to contact us for more information or request a quotation for encoder disc.
Reference Reading:
Magnetic Ring Reference reading:
- How to choose magnetic ring for magnetic encoder?
- How to determine the number of magnetic pole pairs in a multi-pole magnetic encoder ring?
- When to Use Rubber Multi-pole Encoder Rings for Speed detaction
- How to Improve the Accuracy of Multi-pole Magnetic Ring
- Application of Multi-Pole Magnetic Rings in Robot Arms
- 2 Track Nonius Encoder Discs for High-Resolution magnetic encoder Systems
