MPL 40x10x4 / N38 - lamellar magnet

Pros as well as cons of neodymium magnets.

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

• Their power is maintained, and after approximately 10 years it decreases only by ~1% (theoretically),
• They maintain their magnetic properties even under external field action,
• By using a smooth layer of gold, the element has an elegant look,
• Magnetic induction on the surface of the magnet is maximum,
• Neodymium magnets are characterized by extremely 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 flexibility in constructing and the ability to customize to unusual requirements,
• Fundamental importance in modern technologies – they are commonly used in mass storage devices, electromotive mechanisms, advanced medical instruments, and other advanced devices.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• We suggest cover - magnetic mount, due to difficulties in creating threads inside the magnet and complex forms.
• Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small elements of these products are able to disrupt the diagnostic process medical when they are in the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Best holding force of the magnet in ideal parameters – what affects it?

The force parameter is a result of laboratory testing executed under specific, ideal conditions:

• on a base made of structural steel, perfectly concentrating the magnetic field
• whose thickness reaches at least 10 mm
• with a plane free of scratches
• under conditions of ideal adhesion (surface-to-surface)
• under axial application of breakaway force (90-degree angle)
• at room temperature

Magnet lifting force in use – key factors

In real-world applications, the actual holding force depends on many variables, ranked from crucial:

• Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) 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 nominal value.
• Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
• Chemical composition of the base – low-carbon steel attracts best. Alloy steels decrease magnetic properties and lifting capacity.
• Surface finish – ideal contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
• Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under parallel forces the lifting capacity is smaller. In addition, even a small distance {between} the magnet and the plate decreases the load capacity.