Pole rings MWR & MWI

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.

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

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]
NameNumber of polesPole pitch [mm]
31.87/20/10

MWx0200FAA

MWx0100FAB

MWx0050FAC

MWx0040FAD

MWx0020FAE

200

100

50

40

20

0.5

1

2

2.5

5

40.78/30/10

MWx0256FAA

MWx0128FAB

MWx0064FAC

256

128

64

0.5

1

2

57.3/45/10

MWx0360FAA

MWx0180FAB

MWx0090FAC

MWx0072FAD

MWx0036FAE

360

180

90

72

36

0.5

1

2

2.5

5

122/90/10

MWx0768FAA

MWx0384FAB

MWx0192FAC

768

384

192

0.5

1

2

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]
NameNumber of polesPole pitch [mm]
38/30/6.5

MWx0240HAA

MWx0120HAB

MWx0060HAC

MWx0048HAD

MWx0024HAE

240

120

60

48

24

0.5

1

2

2.5

5

41.2/25.05/10

MWx0260HAA

MWx0128HAB

MWx0064HAC

260

128

64

0.5

1

2

72/54/7

MWx0226HAB

MWx0112HAC

226

112

1

2

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]
NameNumber of polesPole pitch [mm]
20.44/15.5/3.5

MWR0032KAC

32

2

29/25/5.5

MWx0180KAA

MWx0090KAB

MWx0046KAC

MWx0036KAD

MWx0018KAE

180

90

46

36

18

0.5

1

2

2.5

5

31.7/25/5.5

MWx0200KAA

MWx0100KAB

MWx0050KAC

MWx0040KAD

MWx0020KAE

200

100

50

40

20

0.5

1

2

2.5

5

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.

Product information

Application information

  • Active measurement scales

    Application note for the use of magnetic scales

    >>coming soon<<

CAD drawing

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