MPL 10x5x1.5 / N38 - lamellar magnet

Pros as well as cons of neodymium magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They do not lose power, even during nearly ten years – the drop in lifting capacity is only ~1% (based on measurements),
• They maintain their magnetic properties even under external field action,
• In other words, due to the reflective layer of nickel, the element becomes visually attractive,
• Magnetic induction on the surface of the magnet is strong,
• Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to versatility in shaping and the capacity to modify to specific needs,
• Significant place in future technologies – they find application in mass storage devices, motor assemblies, precision medical tools, also multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in compact constructions

Disadvantages of NdFeB magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• We suggest cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex shapes.
• Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these magnets can be problematic in diagnostics medical in case of swallowing.
• Due to expensive raw materials, their price exceeds standard values,

Magnetic strength at its maximum – what contributes to it?

The declared magnet strength refers to the peak performance, recorded under ideal test conditions, specifically:

• using a sheet made of high-permeability steel, serving as a ideal flux conductor
• with a cross-section no less than 10 mm
• with a plane free of scratches
• without any insulating layer between the magnet and steel
• for force acting at a right angle (in the magnet axis)
• at conditions approx. 20°C

Practical lifting capacity: influencing factors

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

• Air gap (between the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
• Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
• Steel thickness – too thin plate does not close the flux, causing part of the power to be lost into the air.
• Steel type – mild steel gives the best results. Alloy steels decrease magnetic properties and holding force.
• Smoothness – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Thermal factor – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance {between} the magnet and the plate lowers the load capacity.