UMGB 75x28 [M10x3] GW F200 PLATINIUM + Lina GOBLIN / N52 - goblin magnetic holder

Strengths and weaknesses of rare earth magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

• They retain full power for around 10 years – the drop is just ~1% (based on simulations),
• They have excellent resistance to magnetic field loss as a result of opposing magnetic fields,
• A magnet with a metallic nickel surface has an effective appearance,
• Magnets are distinguished by exceptionally strong magnetic induction on the surface,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
• Thanks to flexibility in forming and the capacity to adapt to individual projects,
• Significant place in modern industrial fields – they serve a role in computer drives, motor assemblies, medical equipment, as well as other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions

Disadvantages of NdFeB magnets:

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
• Limited possibility of creating threads in the magnet and complex shapes - preferred is a housing - mounting mechanism.
• Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these products can complicate diagnosis medical after entering the body.
• With budget limitations the cost of neodymium magnets is a challenge,

Best holding force of the magnet in ideal parameters – what contributes to it?

Magnet power is the result of a measurement for the most favorable conditions, assuming:

• with the contact of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
• with a cross-section minimum 10 mm
• characterized by smoothness
• under conditions of ideal adhesion (metal-to-metal)
• under axial force direction (90-degree angle)
• in neutral thermal conditions

Practical lifting capacity: influencing factors

In practice, the actual holding force depends on several key aspects, ranked from crucial:

• Gap (between the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
• Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
• Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
• Thermal environment – heating the magnet causes a temporary drop of induction. Check the maximum operating temperature for a given model.

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, in contrast under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance {between} the magnet’s surface and the plate lowers the lifting capacity.