UMP 75x25 [M10x3] GW F200 GOLD Lina / N42 - search holder

Strengths and weaknesses of NdFeB magnets.

Apart from their notable holding force, neodymium magnets have these key benefits:

• They retain full power for almost 10 years – the loss is just ~1% (in theory),
• Neodymium magnets are characterized by extremely resistant to demagnetization caused by external field sources,
• In other words, due to the aesthetic surface of gold, the element gains a professional look,
• The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
• Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to the option of flexible forming and customization to specialized needs, magnetic components can be created in a broad palette of shapes and sizes, which increases their versatility,
• Huge importance in advanced technology sectors – they find application in HDD drives, drive modules, medical devices, also multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in compact constructions

Cons of neodymium magnets and proposals for their use:

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also raises their durability
• Neodymium magnets lose their strength 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 durability even at temperatures up to 230°C
• Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Limited ability of making nuts in the magnet and complex forms - preferred is a housing - mounting mechanism.
• Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
• Due to neodymium price, their price exceeds standard values,

Maximum magnetic pulling force – what it depends on?

The force parameter is a measurement result performed under standard conditions:

• on a plate made of mild steel, effectively closing the magnetic field
• with a cross-section minimum 10 mm
• with a plane free of scratches
• without any insulating layer between the magnet and steel
• for force applied at a right angle (pull-off, not shear)
• in stable room temperature

Lifting capacity in real conditions – factors

It is worth knowing that the working load may be lower influenced by elements below, in order of importance:

• Clearance – existence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
• Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Steel grade – ideal substrate is high-permeability steel. Stainless steels may attract less.
• Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
• Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

* Lifting capacity was measured with the use of a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance {between} the magnet and the plate lowers the holding force.