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

Advantages and disadvantages of neodymium magnets.

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

• They do not lose magnetism, even during nearly ten years – the drop in power is only ~1% (theoretically),
• They show high resistance to demagnetization induced by external magnetic fields,
• A magnet with a smooth silver surface has an effective appearance,
• The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
• 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 flexibility in shaping and the ability to modify to client solutions,
• Key role in future technologies – they serve a role in mass storage devices, electric motors, medical equipment, and modern systems.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
• We recommend cover - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complicated forms.
• Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets can be problematic in diagnostics medical when they are in the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Maximum lifting force for a neodymium magnet – what affects it?

The lifting capacity listed is a result of laboratory testing executed under the following configuration:

• with the contact of a yoke made of special test steel, ensuring full magnetic saturation
• possessing a massiveness of minimum 10 mm to avoid saturation
• characterized by smoothness
• under conditions of gap-free contact (metal-to-metal)
• for force acting at a right angle (pull-off, not shear)
• at room temperature

What influences lifting capacity in practice

Holding efficiency impacted by specific conditions, mainly (from priority):

• Gap (between the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, rust 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 nominal value.
• Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
• Steel grade – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
• Smoothness – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
• Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate reduces the lifting capacity.