MW 14x10 / N38 - cylindrical magnet

Pros as well as cons of neodymium magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They have stable power, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
• They feature excellent resistance to magnetic field loss due to external magnetic sources,
• By applying a smooth layer of nickel, the element presents an professional look,
• The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
• 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 the ability of free shaping and customization to specialized needs, neodymium magnets can be manufactured in a variety of shapes and sizes, which increases their versatility,
• Huge importance in future technologies – they are used in magnetic memories, motor assemblies, precision medical tools, also industrial machines.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

What to avoid - cons of neodymium magnets and ways of using them

• They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
• Neodymium magnets lose strength 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
• 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 realizing nuts and complicated shapes in magnets, we recommend using casing - magnetic mount.
• Potential hazard resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child health protection. Additionally, small elements of these products can disrupt the diagnostic process medical when they are in the body.
• Due to complex production process, their price exceeds standard values,

Maximum lifting force for a neodymium magnet – what affects it?

The force parameter is a result of laboratory testing executed under specific, ideal conditions:

• with the contact of a yoke made of special test steel, ensuring maximum field concentration
• whose thickness equals approx. 10 mm
• characterized by even structure
• without the slightest clearance between the magnet and steel
• under axial application of breakaway force (90-degree angle)
• in neutral thermal conditions

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity impacted by specific conditions, including (from most important):

• Distance (between the magnet and the plate), as even a very small distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, corrosion or dirt).
• Angle of force application – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
• Material composition – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
• Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
• Temperature – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

* Lifting capacity was assessed with the use of a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the holding force is lower. Moreover, even a minimal clearance {between} the magnet’s surface and the plate lowers the holding force.