UMP 75x25 [M10x3] GW F200 PLATINIUM / N52 - search holder

Pros as well as cons of neodymium magnets.

Besides their remarkable strength, neodymium magnets offer the following advantages:

• They retain full power for nearly ten years – the drop is just ~1% (based on simulations),
• They feature excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
• The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to present itself better,
• Magnets have excellent magnetic induction on the working surface,
• 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...
• Considering the option of free shaping and adaptation to specialized solutions, neodymium magnets can be produced in a broad palette of forms and dimensions, which expands the range of possible applications,
• Key role in high-tech industry – they serve a role in magnetic memories, motor assemblies, advanced medical instruments, and industrial machines.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

What to avoid - cons of neodymium magnets: application proposals

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
• Neodymium magnets decrease their strength 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
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in producing threads and complicated forms in magnets, we propose using cover - magnetic mount.
• Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Furthermore, small components of these devices can be problematic in diagnostics medical when they are in the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Best holding force of the magnet in ideal parameters – what it depends on?

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

• using a plate made of low-carbon steel, serving as a ideal flux conductor
• with a thickness minimum 10 mm
• with an ground touching surface
• without any insulating layer between the magnet and steel
• during pulling in a direction vertical to the plane
• at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Bear in mind that the working load may be lower depending on the following factors, starting with the most relevant:

• Air gap (between the magnet and the plate), because even a very small distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, corrosion or dirt).
• Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
• Plate thickness – too thin plate does not accept the full field, causing part of the flux to be lost to the other side.
• Material composition – different alloys attracts identically. High carbon content worsen the attraction effect.
• Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
• Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity was determined with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the holding force is lower. In addition, even a small distance {between} the magnet and the plate decreases the holding force.