UMGB 75x28 [M10x3] GW F200 GOLD +Lina GOBLIN / N42 - goblin magnetic holder

Strengths and weaknesses of NdFeB magnets.

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

• They retain magnetic properties for nearly 10 years – the drop is just ~1% (in theory),
• Neodymium magnets are distinguished by exceptionally resistant to magnetic field loss caused by magnetic disturbances,
• Thanks to the shimmering finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an modern appearance,
• Neodymium magnets generate maximum magnetic induction on a small surface, which allows for strong attraction,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Thanks to modularity in constructing and the capacity to modify to complex applications,
• Key role in future technologies – they are commonly used in HDD drives, drive modules, diagnostic systems, and other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in compact constructions

What to avoid - cons of neodymium magnets: application proposals

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 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 a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex forms.
• Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these devices can be problematic in diagnostics medical after entering the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Best holding force of the magnet in ideal parameters – what it depends on?

The specified lifting capacity refers to the maximum value, recorded under ideal test conditions, specifically:

• using a sheet made of high-permeability steel, functioning as a circuit closing element
• with a thickness of at least 10 mm
• with an ideally smooth contact surface
• with total lack of distance (without paint)
• for force acting at a right angle (pull-off, not shear)
• at room temperature

Practical aspects of lifting capacity – factors

In real-world applications, the real power results from many variables, presented from the most important:

• Distance (between the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
• Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
• Plate thickness – too thin plate does not close the flux, causing part of the flux to be escaped to the other side.
• Chemical composition of the base – mild steel attracts best. Alloy admixtures reduce magnetic permeability and lifting capacity.
• Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
• Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, however under shearing force the holding force is lower. Moreover, even a slight gap {between} the magnet and the plate reduces the holding force.