UMGB 75x28 [M8+M10] GW F200 +Lina GOBLIN / N38 - goblin magnetic holder

Strengths and weaknesses of NdFeB magnets.

Besides their exceptional field intensity, neodymium magnets offer the following advantages:

• They retain magnetic properties for nearly 10 years – the drop is just ~1% (according to analyses),
• Magnets perfectly resist against demagnetization caused by ambient magnetic noise,
• Thanks to the reflective finish, the plating of nickel, gold, or silver gives an elegant appearance,
• Magnets possess impressive magnetic induction on the active area,
• Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to freedom in forming and the capacity to customize to client solutions,
• Huge importance in modern industrial fields – they find application in computer drives, electric drive systems, advanced medical instruments, also industrial machines.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

What to avoid - cons of neodymium magnets and ways of using them

• At strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
• When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in realizing threads and complex forms in magnets, we propose using cover - magnetic holder.
• Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small components of these magnets can complicate diagnosis medical after entering the body.
• Due to complex production process, their price is relatively high,

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Magnet power was determined for ideal contact conditions, assuming:

• with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
• whose thickness is min. 10 mm
• characterized by lack of roughness
• under conditions of ideal adhesion (metal-to-metal)
• during pulling in a direction perpendicular to the plane
• at room temperature

Determinants of practical lifting force of a magnet

It is worth knowing that the application force may be lower influenced by elements below, in order of importance:

• Clearance – the presence of any layer (rust, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
• Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
• Base smoothness – the more even the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
• Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

* Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the load capacity is reduced by as much as 75%. In addition, even a small distance {between} the magnet and the plate reduces the load capacity.