MPL 40x7x3 / N38 - lamellar magnet

Strengths and weaknesses of rare earth magnets.

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:

• They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
• They show high resistance to demagnetization induced by external disturbances,
• The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to present itself better,
• Neodymium magnets deliver maximum magnetic induction on a small surface, which ensures high operational effectiveness,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
• Possibility of accurate modeling and adapting to concrete requirements,
• Versatile presence in modern technologies – they are used in mass storage devices, electric drive systems, medical devices, also industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in compact constructions

What to avoid - cons of neodymium magnets: tips and applications.

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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 extremely resistant to heat
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
• We recommend casing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex shapes.
• Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these devices can complicate diagnosis medical after entering the body.
• With budget limitations the cost of neodymium magnets can be a barrier,

Optimal lifting capacity of a neodymium magnet – what affects it?

Information about lifting capacity was determined for ideal contact conditions, assuming:

• with the contact of a sheet made of special test steel, ensuring full magnetic saturation
• whose transverse dimension equals approx. 10 mm
• characterized by even structure
• under conditions of no distance (surface-to-surface)
• during pulling in a direction vertical to the plane
• at temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Real force impacted by working environment parameters, mainly (from priority):

• Clearance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Load vector – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
• Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
• Material composition – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
• Surface condition – ground elements guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
• Thermal factor – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

* Lifting capacity was determined with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the lifting capacity is smaller. Moreover, even a small distance {between} the magnet’s surface and the plate lowers the load capacity.