SM 32x150 [2xM8] / N42 - magnetic separator

Advantages as well as disadvantages of rare earth magnets.

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:

• Their magnetic field is durable, and after around 10 years it drops only by ~1% (theoretically),
• They retain their magnetic properties even under external field action,
• By covering with a decorative layer of gold, the element presents an elegant look,
• Neodymium magnets achieve maximum magnetic induction on a their surface, which increases force concentration,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Possibility of exact forming as well as optimizing to precise conditions,
• Significant place in electronics industry – they are utilized in HDD drives, drive modules, advanced medical instruments, and multitasking production systems.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Cons of neodymium magnets: tips and applications.

• To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Limited ability of making threads in the magnet and complicated forms - preferred is cover - mounting mechanism.
• Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these devices are able to disrupt the diagnostic process medical after entering the body.
• Due to expensive raw materials, their price is relatively high,

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

Breakaway force was determined for optimal configuration, including:

• on a base made of mild steel, effectively closing the magnetic field
• with a cross-section minimum 10 mm
• with a surface cleaned and smooth
• without any air gap between the magnet and steel
• during detachment in a direction vertical to the mounting surface
• in stable room temperature

Lifting capacity in real conditions – factors

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

• Clearance – the presence of any layer (rust, dirt, gap) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
• Load vector – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
• Plate material – mild steel gives the best results. Alloy admixtures decrease magnetic properties and holding force.
• Surface finish – full contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
• Thermal factor – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, in contrast under parallel forces the holding force is lower. Moreover, even a minimal clearance {between} the magnet’s surface and the plate lowers the lifting capacity.