01for flexible use

Plastic-bonded magnets with a PA or PPS matrix for many different applications are injected directly onto the carrier using injection moulding. In the process, the material shrinkage of the solidifying moulded material, as well as the different expansion coefficients of the material pairings, cause internal tension and can lead to the formation of cracks. When using elastomer-bonded magnets, this problem can be overcome thanks to the high elasticity of the material. In addition, the material forms a chemical compound with the carrier material, which means that no elaborate undercuts are required. MS-Schramberg stands ready to assist you with the mechanical and magnetic design of your components and has the necessary tools for magnetic, mechanical and thermal simulations. We can carry out all of the relevant tests in our laboratories.

Technical Data

  • material designation HF 9/22 e
  • typical remanence of 230 mT
  • anisotropic
  • typical magnetisation: multipolar at the perimeter ans sectoral
  • minimum pole width approx. 1.0 mm
  • Elastomer: NBR or HNBR

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02Advantages / Benefits

material with
high elasticity

very precise magnetisation

good bond with different
carrier materials

different Elastomer mixtures up to a maximum of 180°C

high media resistance

no cracks from expansion
during the assembly

high impact resistance

multi-track magnetisation

03Applications

A typical application for elastomer-bonded magnets are magnetic pole rings and sensor magnets for position and speed detection as well as rotor position sensors.

Areas of Application

  • transmissions
  • robots
  • pneumatic and hydraulic cylinders
  • ball bearings
  • rotary encoders / resolvers
  • Rotary for small drives

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Industries

  • automotive
  • mechanical engineering
  • automation technology
  • building services
  • energy and environmental technology
  • medical technology

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04PERFECTLY JOINED WITHOUT TENSION

Some applications cause plastic-bonded magnets, which are produced using injection moulding and are injected right onto a carrier, to reach their limits. Material shrinkage of the solidifying material as well as different expansion coefficients can cause internal tension and even cracks. That is why MS-Schramberg is adding elastomer-bonded magnets to its portfolio. They offer significant benefits in these cases due to their high elasticity.

HIGH ELASTICITY AND CHEMICAL COMPOUNDS

In these cases, elastomer-bonded magnets are a much better alternative. Here, too, a magnetic powder ensures the desired magnetic effect. However, it is not added to a thermoplastic but rather a synthetic elastomer, such as hydrogenated or non-hydrogenated acrylonitrile butadiene rubber (HNBR, NBR). These materials boast a much greater elasticity than thermoplastics. In addition, the elastomer forms a chemical bond with the carrier material when it is applied. This ensures a particularly reliable and strong bond without internal tensions within the magnet. Furthermore, elastomers feature a high impact resistance and are extremely resistant to many media, such as lubricants and chemicals. Depending on the material, the temperature resistance is up to 180°C. Cracks as a result of expansion during assembly are virtually impossible thanks to the high elasticity.

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VARIOUS MAGNETISATION TYPES POSSIBLE

Another advantage of elastomer-bonded magnets is the high homogeneity of the base material. This permits a particularly accurate magnetisation – ideal for applications for which precision is key. Anisotropic magnets can be manufactured with a typical remanence of 230 millitesla. The type of magnetisation used most often is multipolar at the perimeter or sectoral. However, other magnetisation types are possible upon request. The minimum pole width is about one millimetre.

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NEW MATERIALS FOR ADDITIONAL APPLICATIONS

Thanks to the use of elastomer-bonded magnets, MS-Schramberg can significantly expand the scope of application of its products. They are ideal, for example, when thermoplastic magnets cannot be injected into sleeves directly because of the resulting material shrinkage, or when ring magnets, due to the formation of cracks, cannot be injected straight onto the carrier materials but have to be glued on instead. Elastomers are also a functional solution when a high pole pitch accuracy is required or if the expansion coefficients of the carrier material and the magnet differ greatly. In some cases, their use also allows the selection of other carrier materials that make components less expensive to manufacture. Overall, elastomer-bonded magnets offer a significant potential for optimisations in many scenarios.

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05Contact form

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06We are there for you

Do not hesitate and call us, send an email or simply use our contact form. We are looking forward to your message

Heinz Schell

Key Account Manager
DE - PLZ-Area 9

+49 7422/519-1504

07BECAUSE OUR AREAS OF
EXPERTISE ARE INTERLINKED

IDEAS TRANSFORM INTO A SUCCESS STORY FOR YOU

 

The requirements expected of permanent magnets and magnet assemblies are becoming ever more individual and, at the same time, ever more complex. We therefore take pleasure in casting light on the entire value-added chain: We are there beside you as a dependable partner, all the way from shared product development to on-schedule delivery. Thanks to our expertise from design to production, which has always distinguished us, we provide top-quality processes from a single source – either as a specialist or an all-rounder. Together, we can transform a good idea into a genuine competitive advantage. After all, for you, the perfect amalgam of experience, expertise and technical implementation means, above all, one thing – efficiency. This creates results that firmly embed success in your products.

 

 

THE POWER OF THE WHOLE

 

MS-Schramberg has stood for solution expertise and quality for more than half a century. We are one of Europe’s leading manufacturers of permanent magnets and assemblies. With around 600 employees, we develop and produce customer-specific articles in three plants in the Black Forest, which are used successfully by companies from a wide range of industries worldwide.