BM 850x180x70 [4x M8] - magnetic beam

Pros and cons of neodymium magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They retain attractive force for around 10 years – the loss is just ~1% (in theory),
• Neodymium magnets are distinguished by exceptionally resistant to magnetic field loss caused by external interference,
• Thanks to the glossy finish, the coating of Ni-Cu-Ni, gold-plated, or silver-plated gives an professional appearance,
• Magnets exhibit excellent magnetic induction on the outer side,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
• Thanks to the ability of accurate shaping and adaptation to specialized projects, NdFeB magnets can be manufactured in a broad palette of shapes and sizes, which increases their versatility,
• Wide application in future technologies – they find application in magnetic memories, drive modules, advanced medical instruments, also modern systems.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Cons of neodymium magnets and ways of using them

• To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• We suggest casing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
• Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these products can be problematic in diagnostics medical after entering the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Highest magnetic holding force – what it depends on?

Breakaway force was defined for the most favorable conditions, including:

• with the application of a sheet made of special test steel, ensuring full magnetic saturation
• with a cross-section minimum 10 mm
• with a plane perfectly flat
• without the slightest air gap between the magnet and steel
• during pulling in a direction perpendicular to the plane
• at conditions approx. 20°C

Magnet lifting force in use – key factors

Bear in mind that the working load will differ influenced by elements below, in order of importance:

• Clearance – the presence of foreign body (paint, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
• Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
• Metal type – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
• Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
• Temperature – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance {between} the magnet’s surface and the plate reduces the lifting capacity.