MPL 40x18x10 SH / N38 - lamellar magnet

Advantages as well as disadvantages of rare earth magnets.

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

• They retain magnetic properties for almost ten years – the loss is just ~1% (in theory),
• They are resistant to demagnetization induced by presence of other magnetic fields,
• A magnet with a metallic silver surface has an effective appearance,
• Magnetic induction on the surface of the magnet remains strong,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
• Considering the ability of free molding and customization to custom projects, NdFeB magnets can be produced in a variety of forms and dimensions, which increases their versatility,
• Wide application in high-tech industry – they are used in mass storage devices, drive modules, medical devices, also industrial machines.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages of NdFeB magnets:

• To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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 very resistant to heat
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
• Due to limitations in realizing threads and complex shapes in magnets, we propose using a housing - magnetic holder.
• Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. Additionally, small components of these magnets are able to complicate diagnosis medical after entering the body.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

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

Information about lifting capacity was defined for ideal contact conditions, taking into account:

• with the contact of a sheet made of low-carbon steel, ensuring maximum field concentration
• possessing a massiveness of min. 10 mm to ensure full flux closure
• characterized by lack of roughness
• without the slightest air gap between the magnet and steel
• under perpendicular force direction (90-degree angle)
• at temperature room level

Lifting capacity in real conditions – factors

Bear in mind that the magnet holding will differ depending on elements below, in order of importance:

• Gap (betwixt the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
• Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
• Metal type – not every steel reacts the same. High carbon content worsen the interaction with the magnet.
• Plate texture – smooth surfaces ensure maximum contact, which improves force. Rough surfaces weaken the grip.
• Thermal environment – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.

* Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a small distance {between} the magnet and the plate lowers the lifting capacity.