ZK XLINK 1026 elementów - construction toy

Advantages and disadvantages of neodymium magnets.

Apart from their consistent holding force, neodymium magnets have these key benefits:

• They retain magnetic properties for almost ten years – the loss is just ~1% (in theory),
• They are extremely resistant to demagnetization induced by external magnetic fields,
• A magnet with a metallic gold surface has an effective appearance,
• They show high magnetic induction at the operating surface, which improves attraction properties,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures reaching 230°C and above...
• Thanks to the potential of free molding and adaptation to specialized projects, magnetic components can be produced in a variety of shapes and sizes, which makes them more universal,
• Huge importance in future technologies – they are utilized in computer drives, brushless drives, diagnostic systems, as well as technologically advanced constructions.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

What to avoid - cons of neodymium magnets: tips and applications.

• To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• When exposed to high temperature, neodymium magnets suffer a drop in force. 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 resistant to moisture, in case of application outdoors
• Due to limitations in realizing threads and complex shapes in magnets, we propose using cover - magnetic mechanism.
• Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Furthermore, small elements of these magnets can complicate diagnosis medical in case of swallowing.
• With large orders the cost of neodymium magnets is a challenge,

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Breakaway force is the result of a measurement for the most favorable conditions, assuming:

• on a base made of structural steel, effectively closing the magnetic flux
• with a cross-section of at least 10 mm
• with an ground touching surface
• with direct contact (no paint)
• under axial application of breakaway force (90-degree angle)
• at temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

Real force impacted by specific conditions, such as (from priority):

• Distance (between the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Steel thickness – insufficiently thick steel does not accept the full field, causing part of the power to be lost into the air.
• Material type – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
• Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
• Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was determined with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.