MPL 5x5x1.5 / N38 - lamellar magnet

Pros as well as cons of neodymium magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• Their strength is durable, and after around 10 years it decreases only by ~1% (according to research),
• They feature excellent resistance to weakening of magnetic properties when exposed to external fields,
• In other words, due to the smooth layer of gold, the element gains visual value,
• Magnets have very high magnetic induction on the outer side,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
• Possibility of precise modeling as well as adjusting to defined requirements,
• Fundamental importance in innovative solutions – they are commonly used in magnetic memories, electric motors, advanced medical instruments, also other advanced devices.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

Drawbacks and weaknesses 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.
• Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Due to limitations in producing threads and complex shapes in magnets, we propose using casing - magnetic holder.
• Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can disrupt the diagnostic process medical when they are in the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

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

Magnet power was defined for optimal configuration, including:

• with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
• with a cross-section no less than 10 mm
• with an ground contact surface
• under conditions of no distance (metal-to-metal)
• during detachment in a direction vertical to the mounting surface
• at ambient temperature room level

Practical lifting capacity: influencing factors

Please note that the application force may be lower subject to elements below, starting with the most relevant:

• Distance (between the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or debris).
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
• Base massiveness – too thin steel does not close the flux, causing part of the power to be wasted to the other side.
• Material composition – not every steel reacts the same. High carbon content worsen the attraction effect.
• Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
• Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance {between} the magnet’s surface and the plate lowers the lifting capacity.