SM 32x450 [2xM8] / N52 - magnetic separator

Pros as well as cons of rare earth magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• Their magnetic field is maintained, and after approximately ten years it decreases only by ~1% (according to research),
• They are extremely resistant to demagnetization induced by presence of other magnetic fields,
• By using a lustrous layer of silver, the element gains an professional look,
• Magnetic induction on the working part of the magnet is extremely intense,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
• Considering the potential of flexible molding and adaptation to custom needs, magnetic components can be created in a variety of geometric configurations, which amplifies use scope,
• Huge importance in innovative solutions – they are used in hard drives, electric drive systems, diagnostic systems, as well as industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in compact constructions

Disadvantages of NdFeB magnets:

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects 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 power 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
• They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• We suggest a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated shapes.
• Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these magnets can complicate diagnosis medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting capacity of the magnet – what it depends on?

Information about lifting capacity is the result of a measurement for optimal configuration, including:

• using a sheet made of low-carbon steel, serving as a ideal flux conductor
• whose thickness reaches at least 10 mm
• with a surface perfectly flat
• under conditions of no distance (metal-to-metal)
• during pulling in a direction vertical to the plane
• in temp. approx. 20°C

What influences lifting capacity in practice

During everyday use, the real power depends on several key aspects, presented from crucial:

• Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
• Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically 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 converting into lifting capacity.
• Steel type – low-carbon steel attracts best. Higher carbon content reduce magnetic properties and holding force.
• Plate texture – ground elements ensure maximum contact, which increases force. Uneven metal weaken the grip.
• Thermal environment – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

* Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a small distance {between} the magnet and the plate lowers the load capacity.