FM Ruszt magnetyczny do leja fi 200 jednopoziomowy / N52 - magnetic filter

Advantages as well as disadvantages of NdFeB magnets.

Besides their remarkable pulling force, neodymium magnets offer the following advantages:

• Their strength remains stable, and after approximately 10 years it decreases only by ~1% (theoretically),
• They are noted for resistance to demagnetization induced by presence of other magnetic fields,
• In other words, due to the metallic layer of silver, the element gains a professional look,
• The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
• Due to the potential of accurate shaping and customization to unique projects, magnetic components can be modeled in a broad palette of forms and dimensions, which expands the range of possible applications,
• Significant place in advanced technology sectors – they serve a role in hard drives, drive modules, medical devices, and industrial machines.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets and proposals for their use:

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
• When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and 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. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
• We suggest cover - magnetic holder, due to difficulties in creating threads inside the magnet and complex shapes.
• Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these products are able to complicate diagnosis medical when they are in the body.
• Due to neodymium price, their price is higher than average,

Magnetic strength at its maximum – what affects it?

Holding force of 0 kg is a measurement result performed under specific, ideal conditions:

• on a block made of structural steel, perfectly concentrating the magnetic flux
• whose transverse dimension is min. 10 mm
• characterized by even structure
• without the slightest clearance between the magnet and steel
• for force acting at a right angle (in the magnet axis)
• at ambient temperature room level

Practical lifting capacity: influencing factors

Effective lifting capacity is influenced by working environment parameters, such as (from most important):

• Distance – the presence of any layer (paint, dirt, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
• Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
• Steel thickness – too thin plate does not close the flux, causing part of the power to be wasted into the air.
• Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
• Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
• Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Holding force was tested 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 75%. Moreover, even a small distance {between} the magnet’s surface and the plate decreases the lifting capacity.