MPL 50x20x5 / N38 - lamellar magnet

Advantages as well as disadvantages of neodymium magnets.

Apart from their notable magnetism, neodymium magnets have these key benefits:

• They retain magnetic properties for nearly ten years – the drop is just ~1% (in theory),
• They are resistant to demagnetization induced by external field influence,
• By applying a lustrous coating of silver, the element acquires an professional look,
• The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
• Due to the possibility of free shaping and adaptation to custom requirements, magnetic components can be produced in a variety of shapes and sizes, which makes them more universal,
• Versatile presence in innovative solutions – they serve a role in mass storage devices, electric motors, precision medical tools, as well as modern systems.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Problematic aspects of neodymium magnets: application proposals

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
• NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• Due to limitations in producing nuts and complicated shapes in magnets, we propose using cover - magnetic mechanism.
• Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these products can complicate diagnosis medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum holding power of the magnet – what contributes to it?

The load parameter shown concerns the peak performance, obtained under ideal test conditions, namely:

• on a base made of structural steel, perfectly concentrating the magnetic field
• possessing a massiveness of at least 10 mm to ensure full flux closure
• with a surface free of scratches
• under conditions of ideal adhesion (metal-to-metal)
• for force acting at a right angle (pull-off, not shear)
• in temp. approx. 20°C

Practical aspects of lifting capacity – factors

Please note that the working load will differ subject to the following factors, starting with the most relevant:

• Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
• Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
• Base massiveness – too thin steel does not accept the full field, causing part of the flux to be wasted to the other side.
• Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
• Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
• Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate reduces the holding force.