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About Magnet Assemblies
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About Magnet Assemblies
Magnet assemblies consist of groups of two or more
magnets, which attract metal materials using the electric charges of
a magnetic field and another component such as steel to assist with the
magnetic functions. Magnetic assemblies are up to 32 times stronger than
any single magnet. Magnet assemblies often have epoxy coatings to protect
the magnets from chemicals, abrasion and moisture. Adhesives are commonly
used to secure the smaller assemblies in place, especially when magnets
are being adhered to uneven surfaces. Steel pole pieces are used to capture
flux, concentrate it or redirect it to a specified point. Focusing magnetic
flux can also be achieved by tapering the steel poles, but saturation
of the steel may occur, leading to losses in the magnetic circuit.
Magnet assembly suppliers may provide permanent magnets, which emit a
magnetic field without the need for any external source of power. The
other general category of magnet supply is the electromagnets, which
require electricity in order to behave like magnets. Permanent magnets
do not use a power supply making them more energy and room efficient
than electromagnets. However, electromagnets are better in larger devices,
and their magnetic fields are easily adjustable. Rare earth magnets are
kinds of permanent magnets that provide ultimate holding power. Ceramic
(ferrite) magnets are also permanent, and assemblies consisting of them
provide strong, stable magnetic fields. Magnet assembly suppliers my
also offer AlNiCo magnets, which are aluminum-nickel-cobalt magnets that
have the widest range of temperature stability and so are ideal for high-heat
applications. New families of magnetic materials are being developed
from alloys based on Samarium-Iron Nitrides (Sm-Fe-N). Magnetic materials
scientists are also focusing on developing magnets from nano-composite
materials.
Because of the strength of magnet assemblies, they are useful in many
industrial applications in the construction, engineering, automotive,
electronic and agricultural industries, among many others. Magnet assemblies
are used for mounting, lifting, holding and transferring objects, such
as antennae, signs, plates, wheels, actuators and numerous metal parts.
In order to install magnet assemblies, make sure the demagnetizing field
is parallel to the pole pieces. Also, be sure that at least half of the
length of the holding assembly is outside the maximum demagnetizing field.
To easily remove the part, mount the assemblies with their pole pieces
parallel to the direction of release motion. In applications where gravity
is a large part of the release mechanism, pole pieces are mounted parallel
to the ground.
When evaluating the product lines of magnet assembly suppliers, consider
the environment in which the assembly will be used, including temperature
and moisture content. Will the magnet be holding, moving or lifting materials?
What is the holding force needed based on the size and weight of the
parts involved, and how will the assembly be secured, whether bolted,
mounted, fastened or adhered? Also, consider the shape of the magnet
desired (e.g. disc, ring, rectangle, etc.) and the size, including diameter,
length, width and height. Knowing what variation in dimensions is allowed
(tolerances) is important. Price and quantity are also considerations.
Featured
Articles
http://www.dextermag.com/uploadedFiles/Design_and_Tech_CPU.pdf
http://archives.sensorsmag.com/articles/0900/94/main.shtml
Types of Magnet Assemblies
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maintain a heat tolerance higher than that of other magnetic assemblies,
withstanding exposure to temperatures measuring up to 850°F.
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are advantageous during part transference, welding alignments and part
holding applications. Bipolar magnetic assemblies maintain high heat
resistance and wide magnetic reach.
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maintain resistance to demagnetization, can withstand exposure to electrical
fields and vibration and are economical. Their demagnetization resistance
is beneficial in the welding and construction industries, as well as
other environments subject to vibration and electricity, but they do
have low heat resistance.
- made of strontium carbonate and iron oxide.
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require an electric current for the production of a magnetic field.
- are heavy-duty magnets used for industrial applications.
- produce magnets in various sizes and strengths.
- are composed of a combination of neodymium, iron, and boron.
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retain magnetism without a magnetic field. Permanent magnets do not
generate electricity or heat.
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maintain the highest holding ability of all magnetic assemblies in a
compact design but generally possess low heat resistance. Rare earth
magnets consist of neodymium magnets and samarium cobalt magnets, referred
to as rare earth magnets because of their location in the periodic table.
- are composed of elements found in the "Rare Earth" part of the Periodic Table.
- are large, flat magnets that can cover a large area.
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