SMZR 32x225 / N52 - magnetic separator with handle

Advantages and disadvantages of NdFeB magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• Their power is maintained, and after approximately ten years it drops only by ~1% (according to research),
• They retain their magnetic properties even under external field action,
• By using a lustrous layer of gold, the element gains an aesthetic look,
• Neodymium magnets deliver maximum magnetic induction on a their surface, which ensures high operational effectiveness,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Considering the possibility of free molding and customization to custom solutions, NdFeB magnets can be manufactured in a wide range of forms and dimensions, which increases their versatility,
• Versatile presence in electronics industry – they are used in computer drives, brushless drives, diagnostic systems, as well as modern systems.
• Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

• At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power 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
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
• We suggest casing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated forms.
• Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products can be problematic in diagnostics medical after entering the body.
• With budget limitations the cost of neodymium magnets is a challenge,

Magnetic strength at its maximum – what it depends on?

Holding force of 0 kg is a theoretical maximum value performed under specific, ideal conditions:

• with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
• with a thickness no less than 10 mm
• with a surface perfectly flat
• under conditions of ideal adhesion (surface-to-surface)
• during detachment in a direction perpendicular to the mounting surface
• in stable room temperature

Practical lifting capacity: influencing factors

Effective lifting capacity is influenced by working environment parameters, including (from priority):

• Clearance – existence of any layer (paint, dirt, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
• Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of nominal force).
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
• Plate material – mild steel gives the best results. Alloy steels reduce magnetic permeability and lifting capacity.
• Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
• Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a small distance {between} the magnet’s surface and the plate reduces the load capacity.