MW 22x10 / N38 - cylindrical magnet

Strengths and weaknesses of neodymium magnets.

Besides their tremendous strength, neodymium magnets offer the following advantages:

• Their power remains stable, and after around ten years it drops only by ~1% (theoretically),
• They possess excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
• Thanks to the shiny finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
• The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
• In view of the possibility of flexible forming and adaptation to individualized needs, magnetic components can be produced in a variety of forms and dimensions, which makes them more universal,
• Huge importance in innovative solutions – they find application in magnetic memories, electric drive systems, medical equipment, as well as multitasking production systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Cons of neodymium magnets: application proposals

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
• Neodymium magnets decrease their power 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
• They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Due to limitations in creating threads and complicated shapes in magnets, we propose using casing - magnetic mount.
• Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these magnets can be problematic in diagnostics medical after entering the body.
• With large orders the cost of neodymium magnets can be a barrier,

Highest magnetic holding force – what affects it?

The lifting capacity listed is a measurement result conducted under the following configuration:

• on a base made of mild steel, perfectly concentrating the magnetic flux
• with a thickness minimum 10 mm
• characterized by even structure
• under conditions of ideal adhesion (surface-to-surface)
• during pulling in a direction perpendicular to the plane
• at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Please note that the magnet holding may be lower influenced by the following factors, in order of importance:

• Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
• Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
• Steel grade – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
• Base smoothness – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
• Temperature – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance {between} the magnet and the plate reduces the load capacity.