SM 32x125 [2xM8] / N52 - magnetic separator

Pros as well as cons of neodymium magnets.

Besides their tremendous strength, neodymium magnets offer the following advantages:

• Their power remains stable, and after around ten years it decreases only by ~1% (according to research),
• Magnets very well defend themselves against demagnetization caused by ambient magnetic noise,
• In other words, due to the shiny layer of silver, the element looks attractive,
• Neodymium magnets ensure maximum magnetic induction on a small area, which allows for strong attraction,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
• In view of the option of flexible forming and adaptation to individualized requirements, NdFeB magnets can be created in a broad palette of forms and dimensions, which increases their versatility,
• Wide application in future technologies – they are used in hard drives, electromotive mechanisms, advanced medical instruments, as well as modern systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in small systems

Disadvantages of neodymium magnets:

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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 making nuts in the magnet and complex forms - recommended is cover - magnetic holder.
• Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Furthermore, small elements of these products can complicate diagnosis medical in case of swallowing.
• With mass production the cost of neodymium magnets can be a barrier,

Maximum magnetic pulling force – what affects it?

Information about lifting capacity was defined for the most favorable conditions, assuming:

• using a base made of mild steel, acting as a magnetic yoke
• possessing a thickness of minimum 10 mm to avoid saturation
• with an polished touching surface
• under conditions of gap-free contact (surface-to-surface)
• under axial force vector (90-degree angle)
• at room temperature

Lifting capacity in practice – influencing factors

Real force is influenced by specific conditions, including (from most important):

• Distance – the presence of any layer (paint, dirt, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Load vector – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
• Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
• Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
• Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity was assessed with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance {between} the magnet and the plate lowers the lifting capacity.