MPL 5x5x1.5 / N38 - lamellar magnet

Pros and cons of neodymium magnets.

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

• They do not lose magnetism, even during nearly 10 years – the drop in lifting capacity is only ~1% (based on measurements),
• Neodymium magnets prove to be highly resistant to demagnetization caused by external magnetic fields,
• The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
• The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
• In view of the possibility of accurate molding and adaptation to specialized needs, neodymium magnets can be modeled in a variety of geometric configurations, which expands the range of possible applications,
• Universal use in future technologies – they serve a role in magnetic memories, electromotive mechanisms, advanced medical instruments, and other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in small systems

Characteristics of disadvantages of neodymium magnets: tips and applications.

• To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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 very resistant to heat
• They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
• Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these devices can 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 can limit application in large quantities

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The load parameter shown refers to the maximum value, measured under ideal test conditions, meaning:

• using a sheet made of mild steel, functioning as a circuit closing element
• with a cross-section of at least 10 mm
• characterized by lack of roughness
• with direct contact (no impurities)
• during pulling in a direction perpendicular to the plane
• in stable room temperature

Lifting capacity in real conditions – factors

In practice, the actual lifting capacity results from many variables, ranked from most significant:

• Space between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
• Steel thickness – too thin sheet does not close the flux, causing part of the flux to be lost to the other side.
• Material composition – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
• Surface condition – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
• Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance {between} the magnet’s surface and the plate reduces the holding force.