AM lina fi 10 mm - magnetic accessories

Advantages as well as disadvantages of rare earth magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• They virtually do not lose power, because even after ten years the performance loss is only ~1% (according to literature),
• They possess excellent resistance to magnetism drop as a result of external fields,
• In other words, due to the glossy layer of gold, the element gains a professional look,
• Magnets are characterized by extremely high magnetic induction on the working surface,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Thanks to flexibility in forming and the ability to adapt to complex applications,
• Universal use in electronics industry – they are utilized in mass storage devices, electric drive systems, diagnostic systems, and other advanced devices.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

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 in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
• Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
• We recommend casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex forms.
• Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
• With large orders the cost of neodymium magnets is a challenge,

Maximum lifting capacity of the magnet – what affects it?

The load parameter shown represents the maximum value, measured under laboratory conditions, meaning:

• using a base made of mild steel, functioning as a ideal flux conductor
• with a thickness of at least 10 mm
• with a plane free of scratches
• without the slightest clearance between the magnet and steel
• during pulling in a direction perpendicular to the mounting surface
• at temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

During everyday use, the actual lifting capacity results from several key aspects, listed from crucial:

• Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
• Load vector – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
• Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Plate material – low-carbon steel gives the best results. Alloy steels lower magnetic properties and lifting capacity.
• Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
• Thermal factor – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under shearing force the holding force is lower. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.