UMP 75x24 [M8+M10] GW F 200 kg - search holder

Advantages and disadvantages of NdFeB magnets.

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

• They have unchanged lifting capacity, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
• They do not lose their magnetic properties even under external field action,
• Thanks to the metallic finish, the surface of Ni-Cu-Ni, gold, or silver-plated gives an aesthetic appearance,
• They are known for high magnetic induction at the operating surface, making them more effective,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
• Possibility of precise shaping and adapting to atypical requirements,
• Significant place in future technologies – they are commonly used in HDD drives, electric drive systems, precision medical tools, and modern systems.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages of neodymium magnets:

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
• When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
• Limited possibility of creating nuts in the magnet and complex shapes - recommended is casing - mounting mechanism.
• Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to complicate diagnosis medical after entering the body.
• With large orders the cost of neodymium magnets is a challenge,

Magnetic strength at its maximum – what it depends on?

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

• using a base made of mild steel, functioning as a magnetic yoke
• with a thickness of at least 10 mm
• with an ideally smooth contact surface
• without the slightest clearance between the magnet and steel
• during detachment in a direction perpendicular to the plane
• in neutral thermal conditions

Lifting capacity in practice – influencing factors

Please note that the application force may be lower subject to the following factors, in order of importance:

• Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
• Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
• Plate thickness – too thin steel causes magnetic saturation, causing part of the power to be wasted into the air.
• Metal type – different alloys attracts identically. High carbon content worsen the attraction effect.
• Surface finish – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
• Thermal environment – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.