MPL 40x18x10 SH / N38 - lamellar magnet

Pros and cons of NdFeB magnets.

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:

• Their power remains stable, and after around 10 years it drops only by ~1% (theoretically),
• Magnets effectively defend themselves against demagnetization caused by external fields,
• The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to look better,
• Neodymium magnets deliver maximum magnetic induction on a their surface, which ensures high operational effectiveness,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
• Due to the ability of flexible forming and adaptation to individualized solutions, magnetic components can be produced in a wide range of geometric configurations, which amplifies use scope,
• Wide application in future technologies – they serve a role in HDD drives, electric drive systems, diagnostic systems, and industrial machines.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
• When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• We suggest cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated forms.
• Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these products can be problematic in diagnostics medical in case of swallowing.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Detachment force of the magnet in optimal conditions – what affects it?

The specified lifting capacity represents the maximum value, obtained under laboratory conditions, namely:

• on a plate made of mild steel, perfectly concentrating the magnetic field
• whose thickness is min. 10 mm
• with a surface free of scratches
• with zero gap (without paint)
• during pulling in a direction vertical to the plane
• in neutral thermal conditions

Impact of factors on magnetic holding capacity in practice

Please note that the working load will differ subject to the following factors, in order of importance:

• Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
• Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
• Steel grade – the best choice is high-permeability steel. Hardened steels may attract less.
• Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
• Thermal environment – temperature increase causes a temporary drop of induction. Check the maximum operating temperature for a given model.

* Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.