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

Advantages as well as disadvantages of neodymium magnets.

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

• They do not lose magnetism, even during around 10 years – the decrease in strength is only ~1% (based on measurements),
• They retain their magnetic properties even under strong external field,
• A magnet with a metallic nickel surface looks better,
• Neodymium magnets deliver maximum magnetic induction on a their surface, which ensures high operational effectiveness,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
• Thanks to modularity in designing and the ability to customize to client solutions,
• Wide application in innovative solutions – they find application in computer drives, drive modules, medical devices, also modern systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in compact constructions

Disadvantages of NdFeB magnets:

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
• Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• We suggest cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex shapes.
• Possible danger resulting from small fragments of magnets are risky, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these products can disrupt the diagnostic process medical when they are in the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Magnetic strength at its maximum – what it depends on?

The load parameter shown concerns the limit force, measured under ideal test conditions, meaning:

• with the use of a sheet made of special test steel, guaranteeing full magnetic saturation
• whose transverse dimension equals approx. 10 mm
• with a plane cleaned and smooth
• without any insulating layer between the magnet and steel
• under axial force direction (90-degree angle)
• at room temperature

Key elements affecting lifting force

Bear in mind that the working load may be lower subject to elements below, in order of importance:

• Clearance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
• Plate texture – ground elements ensure maximum contact, which increases 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 was determined using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the holding force is lower. Moreover, even a minimal clearance {between} the magnet’s surface and the plate reduces the load capacity.