NCM 15x13.5x5 / N38 - channel magnetic holder

Advantages as well as disadvantages of neodymium magnets.

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:

• They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
• Neodymium magnets remain remarkably resistant to loss of magnetic properties caused by magnetic disturbances,
• In other words, due to the reflective surface of gold, the element looks attractive,
• The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
• Possibility of exact creating as well as adapting to specific conditions,
• Fundamental importance in modern industrial fields – they are commonly used in hard drives, drive modules, medical devices, and technologically advanced constructions.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
• NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
• Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic mechanism.
• Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these products can complicate diagnosis medical in case of swallowing.
• Due to neodymium price, their price exceeds standard values,

Maximum holding power of the magnet – what contributes to it?

The declared magnet strength refers to the peak performance, recorded under optimal environment, meaning:

• using a base made of mild steel, acting as a circuit closing element
• with a cross-section no less than 10 mm
• with an polished touching surface
• without any insulating layer between the magnet and steel
• under perpendicular application of breakaway force (90-degree angle)
• in stable room temperature

What influences lifting capacity in practice

Holding efficiency is influenced by working environment parameters, mainly (from most important):

• Gap between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
• Metal type – not every steel reacts the same. High carbon content worsen the attraction effect.
• Surface finish – full contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
• Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

* Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet’s surface and the plate lowers the lifting capacity.