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Magnets and magnet systems


 

Permanent magnetic material


Hard ferrite magnets - ceramic -

Ceramic magnets can be used in a wide range of situations. In view of their favourable price/performance ratio, they are used in all sorts of industrial and domestic applications. The most common types of ceramic magnetic materials are the anisotropic Strontium, anisotropic Barium and isotropic Barium. The last material is far and away the favourite for low-cost applications.

The basic material for ceramic magnets is iron oxide to which strontium or barium carbonate and a number of other materials are added to obtain the desired type. After an automatic process of measuring, grinding and mixing the raw materials, a sort of knitted substance is
obtained. This substance is pressed under the influence of an anisotropic magnetic field into the required shape. At the completion of this production phase, the product is demagnetised by reversing the magnetic field.

This is done to prevent contamination by loose magnetic particles. After the products have been dried, the extremely critical sintering process follows after which the products have been given the required mechanical properties. Before delivery, the products are magnetised to the specified level and further finished to match the specifications of the customers.

There are two types of permanent magnet materials

Isotropic und anisotropic

Isotropic magnetic materials have an identical magnetic field in all directions.
The consequence of this is that the material can be magnetised in every direction.

An anisotropic magnet is subjected to a strong uni-directional magnetic field during its
pressing. The magnetic properties are the strongest in this direction.


Dimension and tolerances
- isotropic execution -


Ceramic disc magnets, isotropic
Article no. Ø Tolerance Height Tolerance Quality
mm mm
BM 80.020/AXG 8,0 +0,1/-0,2 4,2 +/-0,15 BM1
BM 80.025/MPG 9,4 +/-0,3 2,5 +/-0,2 BM1
BM 80.027 9,4 +/-0,3 4,2 +/-0,2 BM1
BM 80.034 10,0 +/-0,3 4,0 +/-0,2 BM1
BM 80.037 12,0 +/-0,2 4,0 +/-0,1 BM1
BM 80.038/AX 12,1 +/-0,3 6,0 +/-0,2 BM1
BM 80.039 12,5 +/-0,3 4,7 +/-0,2 BM1
BM 80.040 14,0 +/-0,3 3,0 +/-0,2 BM1
BM 80.043 14,0 +0,1/-0,4 5,0 +/-0,2 BM1
BM 80.045 15,0 +/-0,3 6,0 +/-0,2 BM1
BM 80.049* 20,0 +0/-0,6 3,0 +/-0,2 BM1
BM 80.052 20,0 +0/-0,55 5,0 +/-0,2 BM1
BM 80.053 20,0 +0/-0,55 6,0 +/-0,2 BM1
BM 80.060 25,0 +0,2/-0,7 3,0 +/-0,2 BM1
BM 80.061* 25,0 +0,2/-0,7 4,0 +/-0,2 BM1
BM 80.063 25,0 +0,2/-0,7 5,0 +/-0,2 BM1
BM 80.064 25,0 +0,2/-0,7 6,35 +/-0,2 BM1
BM 80.070 30,0 +0,2/-0,8 3,0 +/-0,2 BM1
BM 80.073 30,0 +0,2/-0,8 5,0 +/-0,2 BM1
BM 80.076 30,0 +0,2/-0,8 8,0 +/-0,2 BM1


Ceramic block magnets, isotropic
Article no. Length Tolerance Width Tolerance Height Tolerance Qualität
mm mm mm
BM 81.012 8,0 +/-0,2 8,0 +/-0,2 4,35 +/-0,1 BM1
BM 81.013/AX 8,0 +/-0,2 8,0 +/-0,2 5,0 +/-0,1 BM1
BM 81.027 18,0 +/-0,5 9,5 +/-0,3 4,9 +/-0,2 BM1
BM 81.032 20,0 +/-0,2 15,0 +/-0,2 8,0 +/-0,2 BM1
BM 81.039/MPG 24,0 +0/-0,4 9,0 +0/-0,2 5,0 +0/-0,5 BM1
BM 81.041/AX
mit Loch
24,0 +0/-0,9 13,5 +/-0,2 5,0 +0/-0,3 BM1
BM 81.042/AX 24,0 +0/-0,9 13,5 +/-0,2 5,0 +0/-0,3 BM1
BM 81.044/AX 28,0 +0/-0,9 15,0 +/-0,2 5,0 +0/-0,3 BM1
BM 81.056/MPG 30,0 +0,05/-0,75 9,0 +/-0,15 5,0 +/-0,5 BM1
BM 81.063 32,0 +/-0,2 5,8 +/-0,2 2,65 +/-0,1 BM1
BM 81.078/P2 50,0 +0/-1 15,0 +0,1/-0,4 6,0 +/-0,2 BM1


Ceramic ring magnets, isotropic
Article no. Ø Tolerance Ø inside Tolerance Height Tolerance Quality
mm mm mm
BM 82.015 8,0 +/-0,3 4,5 +0,4/-0 3,0 +/-0,25 BM1
BM 82.044/MP 13,0 +/-0,3 5,0 +/-0,3 5,0 +/-0,1 BM1
BM 82.057/P4 15,0 +/-0,3 6,2 +/-0,3 3,0 +/-0,2 BM1
BM 82.075/AX 18,0 +/-0,3 5,0 +/-0,3 5,0 +/-0,1 BM1
BM 82.076/P8* 18,0 +/-0,3 6,1 +/-0,3 5,0 +/-0,2 BM1

Other dimensions on request.

Magnetising methods and technical spedifications your find here



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