MPL 50x50x10 / N38 - lamellar magnet

Advantages and disadvantages of neodymium magnets.

Apart from their consistent holding force, neodymium magnets have these key benefits:

• They do not lose power, even during approximately ten years – the reduction in strength is only ~1% (according to tests),
• Neodymium magnets are characterized by highly resistant to demagnetization caused by external field sources,
• Thanks to the glossy finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an elegant appearance,
• Magnetic induction on the surface of the magnet turns out to be extremely intense,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of individual machining as well as modifying to specific requirements,
• Universal use in high-tech industry – they are utilized in hard drives, motor assemblies, diagnostic systems, and industrial machines.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
• 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 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
• Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Limited ability of producing threads in the magnet and complicated shapes - recommended is cover - mounting mechanism.
• Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these products are able to complicate diagnosis medical in case of swallowing.
• With mass production the cost of neodymium magnets is economically unviable,

Maximum holding power of the magnet – what it depends on?

Holding force of 39.48 kg is a measurement result conducted under specific, ideal conditions:

• using a plate made of mild steel, functioning as a magnetic yoke
• whose transverse dimension reaches at least 10 mm
• characterized by smoothness
• with zero gap (without impurities)
• for force applied at a right angle (in the magnet axis)
• in stable room temperature

Lifting capacity in real conditions – factors

Bear in mind that the magnet holding may be lower influenced by elements below, starting with the most relevant:

• Gap between magnet and steel – 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 – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
• Plate thickness – insufficiently thick sheet does not close the flux, causing part of the power to be wasted into the air.
• Metal type – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
• Surface quality – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
• Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

* Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the holding force is lower. In addition, even a slight gap {between} the magnet and the plate decreases the holding force.