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

Pros as well as cons of NdFeB magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
• Magnets very well resist against loss of magnetization caused by foreign field sources,
• The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• Magnetic induction on the surface of the magnet turns out to be exceptional,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures reaching 230°C and above...
• Thanks to versatility in shaping and the capacity to adapt to client solutions,
• Huge importance in advanced technology sectors – they are utilized in computer drives, electric motors, medical devices, as well as other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in miniature devices

Disadvantages of NdFeB magnets:

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
• 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
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
• We recommend casing - magnetic holder, due to difficulties in producing nuts inside the magnet and complex forms.
• Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child safety. Furthermore, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
• With mass production the cost of neodymium magnets can be a barrier,

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

The declared magnet strength concerns the maximum value, obtained under laboratory conditions, specifically:

• on a base made of structural steel, perfectly concentrating the magnetic flux
• with a cross-section no less than 10 mm
• with a surface free of scratches
• with total lack of distance (without impurities)
• for force applied at a right angle (pull-off, not shear)
• at ambient temperature room level

Magnet lifting force in use – key factors

In real-world applications, the actual lifting capacity is determined by many variables, listed from most significant:

• Clearance – existence of any layer (paint, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Load vector – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
• Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
• Base smoothness – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
• Temperature influence – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

* Lifting capacity was measured by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet and the plate lowers the load capacity.