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RESEARCH & DEVELOPMENT

Coercive field strength det

solenoid valves

SCHERDEL’s know-how of material selection brings

ne of the main products which describes how a material reacts to an
– NEWS AND INFORMATION decades, they have helped boost the meability μr, which is a measure of the
Contact
externally applied magnetic field. It is
O SCHERDEL manufactures is
often quoted in terms of its relative per-
technical springs and, over the
company’s reputation. But the available
permeability of a medium relative to
expert knowledge goes well beyond the
that of a vacuum. At SCHERDEL, the
engineers are concerned mainly with
topic of springs, ensuring the Group is
two types of steel. Ferromagnetic mate-
a leading specialist in the field of form-
ing technology and metalworking. Par-
rials are characterised by a very high
ticularly the extensive knowledge of
relative permeability that is dependent
materials and their properties combined
with intensive basic research and the
field enhancement and field chan-
nelling. In contrast, paramagnetic (in
excellent equipment of the in-house on the field strength. They are used for
MANUFACTURING TECHNIQUES – LOCATIONS – TECHNOLOGY & PRODUCT DEVELOPMENT
SCHERDEL INNOTEC central lab often form the basis for other words non-magnetic) steels are
Forschungs- und manufacturing innovative products and characterised by a low relative perme-
Entwicklungs-GmbH applying new machining processes. ability that is dependent on the field
Components with magnetic properties strength and are thus ‘transparent’ for
Scherdelstr. 2 are a prime example of this. A layper- an externally applied magnetic field.
95615 Marktredwitz son might reasonably assume this They are used when magnetic interac-
Germany refers to components for dynamos and tions are not desired.
Tel.: +49 9231 603-0 electric motors or the magnetic fasten-
ers on refrigerator doors, but the spe- The coercive field strength describes
Contact person cialists at SCHERDEL are actually the force of an external magnetic field
more involved with electromagnetic that is necessary to completely demag-
Dr.-Ing. Christian Konrad shielding, electrical sheets or actuators netise a magnet. A consequence of low
Tel.: +49 9231 603-6447 and solenoid valves for use in vehicle coercive field strength is that the polari-
Email: control technology. ty of an affected part can be reversed
christian.konrad@ faster. This enables, for example, fast
scherdel.de Key factors for soft magnetic applica- switching times and low energy losses
tions, e.g. for shielding or solenoid when using solenoid valves. Generally
valves, are the permeability and the co- speaking, low coercive field strength
ercive field strength. The permeability can also be achieved at ferromagnetic

When determining a component’s
coercive field strength, a fluxgate
magnetometer is applied at
SCHERDEL to carry out measure-
ments to standard DIN EN 10330
Method B.

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