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

Pros and cons of NdFeB magnets.

Apart from their superior power, neodymium magnets have these key benefits:

• They retain magnetic properties for almost ten years – the drop is just ~1% (based on simulations),
• They possess excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
• By covering with a shiny layer of gold, the element has an professional look,
• Neodymium magnets ensure maximum magnetic induction on a small surface, which increases force concentration,
• Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
• Possibility of exact forming as well as optimizing to specific applications,
• Universal use in advanced technology sectors – they are utilized in HDD drives, motor assemblies, medical equipment, also multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which makes them useful in compact constructions

Disadvantages of neodymium magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
• Limited ability of creating threads in the magnet and complicated forms - preferred is casing - magnetic holder.
• Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Additionally, small components of these products can be problematic in diagnostics medical after entering the body.
• With mass production the cost of neodymium magnets is a challenge,

Magnetic strength at its maximum – what it depends on?

Breakaway force is the result of a measurement for the most favorable conditions, assuming:

• with the use of a yoke made of special test steel, guaranteeing full magnetic saturation
• possessing a thickness of minimum 10 mm to avoid saturation
• with an polished touching surface
• without any air gap between the magnet and steel
• for force acting at a right angle (pull-off, not shear)
• in stable room temperature

Lifting capacity in practice – influencing factors

Please note that the working load will differ influenced by elements below, in order of importance:

• Clearance – the presence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Angle of force application – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
• Plate thickness – too thin steel causes magnetic saturation, causing part of the flux to be lost into the air.
• Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
• Surface quality – the more even the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
• Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance {between} the magnet’s surface and the plate reduces the holding force.