UMS 42x12.5x6.5x9 / N38 - conical magnetic holder

Advantages and disadvantages of neodymium magnets.

Apart from their superior magnetism, neodymium magnets have these key benefits:

• They have stable power, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
• They maintain their magnetic properties even under close interference source,
• By covering with a smooth coating of nickel, the element has an proper look,
• Neodymium magnets ensure maximum magnetic induction on a small surface, which allows for strong attraction,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
• Thanks to modularity in constructing and the capacity to modify to unusual requirements,
• Key role in modern industrial fields – they are utilized in magnetic memories, electromotive mechanisms, diagnostic systems, also technologically advanced constructions.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Problematic aspects of neodymium magnets and ways of using them

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
• Neodymium magnets demagnetize 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 very resistant to heat
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in creating threads and complex shapes in magnets, we recommend using cover - magnetic mount.
• Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these magnets can complicate diagnosis medical in case of swallowing.
• With budget limitations the cost of neodymium magnets is economically unviable,

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

The force parameter is a theoretical maximum value executed under specific, ideal conditions:

• with the application of a sheet made of special test steel, ensuring maximum field concentration
• possessing a thickness of at least 10 mm to ensure full flux closure
• with a plane perfectly flat
• without any air gap between the magnet and steel
• during detachment in a direction vertical to the mounting surface
• at temperature room level

Magnet lifting force in use – key factors

It is worth knowing that the application force will differ influenced by the following factors, in order of importance:

• Gap (between the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
• Angle of force application – highest force is available only during perpendicular pulling. The shear force of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
• Base massiveness – too thin sheet does not close the flux, causing part of the power to be wasted to the other side.
• Metal type – not every steel reacts the same. High carbon content worsen the interaction with the magnet.
• Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
• Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under parallel forces the holding force is lower. In addition, even a small distance {between} the magnet’s surface and the plate reduces the holding force.