MPL 15x10x2 / N38 - lamellar magnet

Advantages and disadvantages of NdFeB magnets.

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

• They have unchanged lifting capacity, and over more than ten years their performance decreases symbolically – ~1% (in testing),
• Neodymium magnets are characterized by extremely resistant to demagnetization caused by external magnetic fields,
• By using a shiny layer of silver, the element gains an proper look,
• Magnets exhibit impressive magnetic induction on the active area,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Possibility of detailed forming as well as adapting to complex needs,
• Universal use in innovative solutions – they are used in hard drives, drive modules, advanced medical instruments, as well as industrial machines.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
• We suggest casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
• Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these magnets can complicate diagnosis 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

Magnetic strength at its maximum – what contributes to it?

Magnet power is the result of a measurement for the most favorable conditions, assuming:

• with the use of a sheet made of special test steel, ensuring maximum field concentration
• whose transverse dimension reaches at least 10 mm
• with an ideally smooth contact surface
• without any clearance between the magnet and steel
• for force applied at a right angle (in the magnet axis)
• in temp. approx. 20°C

Practical aspects of lifting capacity – factors

Real force impacted by specific conditions, including (from most important):

• Gap (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
• Direction of force – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
• Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
• Plate material – low-carbon steel attracts best. Alloy admixtures decrease magnetic properties and lifting capacity.
• Surface finish – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
• Temperature – temperature increase causes a temporary drop of induction. Check the maximum operating temperature for a given model.

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance {between} the magnet and the plate decreases the load capacity.