NCM 10x13.5x5 / N38 - channel magnetic holder

Pros and cons of neodymium magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They do not lose power, even after nearly 10 years – the drop in strength is only ~1% (based on measurements),
• They have excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
• The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
• Magnetic induction on the working part of the magnet turns out to be impressive,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
• Thanks to versatility in forming and the ability to customize to specific needs,
• Significant place in electronics industry – they are commonly used in data components, electromotive mechanisms, medical devices, and modern systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of neodymium magnets:

• To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• Neodymium 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 and 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 advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• Due to limitations in creating threads and complicated shapes in magnets, we propose using a housing - magnetic holder.
• Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small components of these products are able to disrupt the diagnostic process medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

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

Information about lifting capacity was determined for the most favorable conditions, assuming:

• using a base made of high-permeability steel, acting as a magnetic yoke
• with a cross-section no less than 10 mm
• characterized by even structure
• under conditions of ideal adhesion (metal-to-metal)
• for force applied at a right angle (pull-off, not shear)
• at ambient temperature room level

Magnet lifting force in use – key factors

In real-world applications, the real power depends on several key aspects, listed from crucial:

• Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
• Direction of force – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
• Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Steel type – low-carbon steel gives the best results. Alloy admixtures reduce magnetic permeability and holding force.
• Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
• Thermal environment – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

* Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance {between} the magnet’s surface and the plate decreases the load capacity.