Pole rings MWR & MWI
General information
Pole rings are used as magnetic measurement scales for angle and speed measurement.
Our pole rings are provided with a magnetic coding using a special in-house procedure. This allows simple rings with incremental tracks or even reference poles or various codings, such as vernier or pseudo random code, to be produced.
Product variants
There are many raw materials that can be used as measurement scales.
We offer pole rings made of
- plastic-bonded hard ferrite
- sintered hard ferrite
- elastomer-bonded hard ferrite on steel substrate
Application examples
Suitable for absolute or incremental applications, e.g.:
- Motor commutation
- Speed measurement
- Angle measurements
General information
The pole rings generally consist of sintered plastic-bonded or elastomer-bonded hard ferrite and are magnetized at the circumference. Incremental pole rings feature alternating magnetized north and south poles. Special coding, such as vernier tracks or pseudo random codes, are also possible. Up to 3 tracks can be magnetized on one ring.
Special magnetizations are of course possible. Please feel free to contact us about this.
Product variant Elastomer bonded hard ferrite rings
| Geometry Outer diameter/inner diameter/height [mm] | Name | Number of poles | Pole pitch [mm] |
|---|---|---|---|
| 31.87/20/10 | MWx0200FAA MWx0100FAB MWx0050FAC MWx0040FAD MWx0020FAE | 200 100 50 40 20 | 0.5 1.0 2.0 2.5 5.0 |
| 40.78/30/10 | MWx0256FAA MWx0128FAB MWx0064FAC | 256 128 64 | 0.5 1.0 2.0 |
| 57.3/45/10 | MWx0360FAA MWx0180FAB MWx0090FAC MWx0072FAD MWx0036FAE | 360 180 90 72 36 | 0.5 1.0 2.0 2.5 5.0 |
| 122/90/10 | MWx0768FAA MWx0384FAB MWx0192FAC | 768 384 192 | 0.5 1.0 2.0 |
Elastomer-bonded hard ferrite rings on steel substrate
The pole rings are distinguished by a durable support which can be attached to a shaft. The outer diameter of the steel substrate features a vulcanized rubber material, which is enriched with hard ferrite particles and can be magnetized.
Rings of sintered hard ferrite
| Geometry Outer diameter/inner diameter/height [mm] | Name | Number of poles | Pole pitch [mm] |
|---|---|---|---|
| 38/30/6.5 | MWx0240HAA MWx0120HAB MWx0060HAC MWx0048HAD MWx0024HAE | 240 120 60 48 24 | 0.5 1.0 2.0 2.5 5.0 |
| 41.2/25.05/10 | MWx0260HAA MWx0128HAB MWx0064HAC | 260 128 64 | 0.5 1.0 2.0 |
| 72/54/7 | MWx0226HAB MWx0112HAC | 226 112 | 1.0 2.0 |
Sintered hard ferrite rings
Sintered hard ferrite rings have high remanence and exhibit a higher field strength after the magnetization process than rings where the hard ferrite particles are bonded in a substrate.
The rings can also be used at high temperatures. However, a suitable support is recommended for assembly.
Rings of plastic bonded hard ferrite
| Geometry Outer diameter/inner diameter/height [mm] | Name | Number of poles | Pole pitch [mm] |
|---|---|---|---|
| 20.44/15.5/3.5 | MWR0032KAC | 32 | 2.0 |
| 29/25/5.5 | MWx0180KAA MWx0090KAB MWx0046KAC MWx0036KAD MWx0018KAE | 180 90 46 36 18 | 0.5 1.0 2.0 2.5 5.0 |
| 31.7/25/5.5 | MWx0200KAA MWx0100KAB MWx0050KAC MWx0040KAD MWx0020KAE | 200 100 50 40 20 | 0.5 1.0 2.0 2.5 5.0 |
Rings of plastic bonded hard ferrite
These rings are produced using injection molding tools. They can be easily manufactured in very high quantities and are therefore well suited to high volume applications. However, due to the manufacturing process, the distribution of the magnetic particles is not always optimal. The rings are mostly produced as anisotropic rings which also has a positive impact on the remanence.
Rings elastomer tape glued to carrier
| Geometry Outer diameter/height [mm] | Name | Number of poles | Pole pitch [mm] |
|---|---|---|---|
| 40-300/5-20 | MWx0XXXYAU-UU | n.A. | 0.5-5.0 |
Rings elastomer tape glued to carrier
An elastomeric tape is glued onto a stable carrier with very small seams. Due to the full-surface bonding, a high speed resistance is achieved. This production method is very suitable for large diameters and is ideal for small and medium quantities or prototypes. Only low tooling costs are required for production.
Further pole rings variants
In addition to the freely available standard pole rings, we also have a large portfolio of customer-specifi c pole rings with different geometry and coding.
The following articles are examples:
Pole ring absolute coded with vernier code
Pole ring injected with reference mark on brass hub
Pole ring incremental, axial coded. Also available as code disk with 1.5 mm tickness
Data sheets
Product information
- Measuring scales
Product information on magnetic measurement scales
- Measuring scales
New product flyer
CAD drawing
- Pole rings
3D-PDF