SM 32x475 [2xM8] / N52 - magnetic separator

Advantages and disadvantages of NdFeB magnets.

Apart from their strong magnetic energy, neodymium magnets have these key benefits:

• They have stable power, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
• They are noted for resistance to demagnetization induced by external disturbances,
• In other words, due to the aesthetic layer of silver, the element looks attractive,
• Neodymium magnets ensure maximum magnetic induction on a small surface, which increases force concentration,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to freedom in shaping and the capacity to modify to client solutions,
• Fundamental importance in high-tech industry – they are used in magnetic memories, electric motors, diagnostic systems, as well as multitasking production systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages of NdFeB magnets:

• At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• When exposed to high temperature, neodymium magnets suffer a drop in power. 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. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Limited possibility of making threads in the magnet and complicated shapes - preferred is a housing - magnet mounting.
• Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small elements of these products are able to complicate diagnosis medical after entering the body.
• Due to neodymium price, their price is relatively high,

Highest magnetic holding force – what affects it?

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

• with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
• possessing a massiveness of at least 10 mm to avoid saturation
• characterized by smoothness
• without any insulating layer between the magnet and steel
• during detachment in a direction vertical to the plane
• at ambient temperature room level

Lifting capacity in real conditions – factors

Please note that the magnet holding will differ depending on elements below, starting with the most relevant:

• Clearance – the presence of any layer (rust, dirt, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
• Steel type – low-carbon steel attracts best. Higher carbon content decrease magnetic properties and holding force.
• Surface quality – the more even the surface, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
• Temperature influence – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. In addition, even a small distance {between} the magnet’s surface and the plate lowers the load capacity.