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

Pros as well as cons of NdFeB magnets.

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

• They do not lose strength, even after around 10 years – the decrease in power is only ~1% (based on measurements),
• Magnets perfectly protect themselves against loss of magnetization caused by foreign field sources,
• The use of an refined finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• Magnets have extremely high magnetic induction on the outer layer,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to modularity in shaping and the capacity to customize to complex applications,
• Versatile presence in high-tech industry – they find application in hard drives, electric motors, precision medical tools, also modern systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems

Characteristics of disadvantages of neodymium magnets: application proposals

• At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
• Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 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 immune to moisture, when using outdoors
• We suggest casing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated forms.
• Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these devices can disrupt the diagnostic process medical in case of swallowing.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Breakaway strength of the magnet in ideal conditions – what affects it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, assuming:

• on a base made of mild steel, perfectly concentrating the magnetic flux
• possessing a thickness of minimum 10 mm to ensure full flux closure
• with an polished touching surface
• under conditions of ideal adhesion (surface-to-surface)
• under axial force vector (90-degree angle)
• in temp. approx. 20°C

Key elements affecting lifting force

In practice, the real power depends on many variables, listed from crucial:

• Clearance – the presence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
• Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
• Material type – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
• Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
• Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, however under shearing force the holding force is lower. Additionally, even a slight gap {between} the magnet and the plate decreases the holding force.