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Pot
magnets are made up of magnets (NdFeB, SmCo, AlNiCo or Hard Ferrite)
and other spare parts, such as metal, plastic, rubber and other
components. Sometimes Pot magnets can meet some special requirements
while a single magnet can not do. In the meantime, using pot magnets
can save more cost than just using magnets and gain the same
purpose.
We can design and
manufacture various magnetic assemblies according to clients
requirements. |
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The basic principle of the holding or pot magnet is to
direct and concentrate the flux from both magnetic poles to one
active face. This is usually achieved with steel pole pieces or a
steel-backing cup.
The
standard selection can be broken down into three material types and
there is a great variety of systems available. The following data
should act as a simple guide:
1) Sintered Ferrite, this material offers a good performance from an
inexpensive magnet, however, they tend to be bulky and are not
always suitable where space is an important factor. The steel parts
are plated & the Ferrite is inert thus corrosion is limited. Maximum
operating temperature is +120 °C.
2) Cast AlNiCo, offers a better holding force than Ferrite systems
and is the only pot magnet that can be heated to extreme
temperatures. However, the high cost of the Cobalt content in the
cast magnet makes the price prohibitive unless the application
requires temperatures over +120°C up to a maximum of +500°C.
3) Rare Earth Samarium & Neodymium, pots and assemblies can offer up
to eleven times the performance of a Ferrite system in a comparable
size. Applications tend to be specialized engineering projects where
performance and available space are key factors. Maximum operating
temperatures are +60°C for the Neodymium and +150°C - +250°C for the
Samarium depending on the design configuration.
When considering your selection, please be aware of the following
factors: The stated Kg Pull (holding/gripping force) is based on the
magnets retaining force against a direct pull when offered to a
clean ground mild steel surface with a minimum thickness of 6mm.
Painted or un-ground surfaces will reduce this force, assemblies
working in shear will support approximately 1/3 of the stated value.
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