UMP 29x10 [M5] GW - search holder

Strengths as well as weaknesses of NdFeB magnets.

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

• They retain attractive force for around 10 years – the drop is just ~1% (according to analyses),
• Magnets very well protect themselves against demagnetization caused by ambient magnetic noise,
• In other words, due to the reflective layer of nickel, the element looks attractive,
• The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
• Thanks to modularity in forming and the capacity to adapt to unusual requirements,
• Universal use in advanced technology sectors – they are utilized in data components, electromotive mechanisms, diagnostic systems, and technologically advanced constructions.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

What to avoid - cons of neodymium magnets and ways of using them

• They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also increases 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 stability even at temperatures up to 230°C
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Limited ability of producing nuts in the magnet and complicated shapes - recommended is casing - mounting mechanism.
• Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Detachment force of the magnet in optimal conditions – what contributes to it?

The declared magnet strength concerns the limit force, measured under ideal test conditions, namely:

• on a base made of structural steel, perfectly concentrating the magnetic field
• whose transverse dimension reaches at least 10 mm
• characterized by smoothness
• without the slightest clearance between the magnet and steel
• under perpendicular force direction (90-degree angle)
• at ambient temperature room level

What influences lifting capacity in practice

Real force is affected by working environment parameters, such as (from most important):

• Distance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
• Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
• Metal type – different alloys reacts the same. High carbon content worsen the attraction effect.
• Surface condition – ground elements guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
• Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate lowers the holding force.