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

Strengths and weaknesses of neodymium magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• They do not lose power, even during around 10 years – the decrease in strength is only ~1% (based on measurements),
• They show high resistance to demagnetization induced by external magnetic fields,
• A magnet with a smooth nickel surface is more attractive,
• The surface of neodymium magnets generates a strong 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...
• In view of the possibility of free forming and adaptation to specialized solutions, magnetic components can be created in a wide range of shapes and sizes, which expands the range of possible applications,
• Key role in advanced technology sectors – they are utilized in computer drives, drive modules, diagnostic systems, and industrial machines.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Problematic aspects of neodymium magnets: weaknesses and usage proposals

• Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
• Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Limited possibility of making nuts in the magnet and complex shapes - preferred is casing - mounting mechanism.
• Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
• With large orders the cost of neodymium magnets is economically unviable,

Best holding force of the magnet in ideal parameters – what contributes to it?

The load parameter shown represents the maximum value, obtained under optimal environment, meaning:

• with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
• with a cross-section no less than 10 mm
• characterized by smoothness
• without the slightest clearance between the magnet and steel
• under perpendicular application of breakaway force (90-degree angle)
• at temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Bear in mind that the application force may be lower influenced by the following factors, in order of importance:

• Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
• Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Steel type – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and lifting capacity.
• Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
• Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 75%. In addition, even a slight gap {between} the magnet’s surface and the plate lowers the holding force.