SM 32x200 [2xM8] / N42 - magnetic separator

Pros as well as cons of neodymium magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• Their power is maintained, and after approximately 10 years it drops only by ~1% (according to research),
• They have excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
• By applying a decorative layer of silver, the element gains an nice look,
• Magnets possess maximum magnetic induction on the working surface,
• Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to freedom in constructing and the ability to adapt to specific needs,
• Fundamental importance in high-tech industry – they are utilized in magnetic memories, brushless drives, medical devices, as well as technologically advanced constructions.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Drawbacks and weaknesses 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.
• Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
• Due to limitations in producing nuts and complex shapes in magnets, we propose using cover - magnetic mechanism.
• Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these products are able to disrupt the diagnostic process medical in case of swallowing.
• Due to expensive raw materials, their price exceeds standard values,

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

The force parameter is a result of laboratory testing executed under the following configuration:

• on a block made of mild steel, effectively closing the magnetic field
• possessing a massiveness of at least 10 mm to avoid saturation
• with an ideally smooth contact surface
• without any insulating layer between the magnet and steel
• during detachment in a direction vertical to the mounting surface
• at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Bear in mind that the working load may be lower depending on the following factors, in order of importance:

• Distance (between the magnet and the plate), as even a tiny distance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
• Load vector – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
• Base massiveness – insufficiently thick sheet does not close the flux, causing part of the power to be lost into the air.
• Steel grade – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
• Surface finish – full contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
• Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was determined with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet’s surface and the plate reduces the lifting capacity.