SMZR 25x225 / N52 - magnetic separator with handle

Pros as well as cons of neodymium magnets.

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

• Their magnetic field is durable, and after around ten years it drops only by ~1% (theoretically),
• They possess excellent resistance to magnetism drop when exposed to opposing magnetic fields,
• A magnet with a smooth nickel surface is more attractive,
• Neodymium magnets achieve maximum magnetic induction on a small area, which ensures high operational effectiveness,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Considering the possibility of precise forming and adaptation to custom requirements, neodymium magnets can be manufactured in a variety of forms and dimensions, which expands the range of possible applications,
• Significant place in innovative solutions – they serve a role in magnetic memories, motor assemblies, diagnostic systems, and technologically advanced constructions.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets: tips and applications.

• To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
• Neodymium magnets decrease their strength 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
• Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Limited possibility of producing nuts in the magnet and complicated forms - preferred is a housing - mounting mechanism.
• Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, small elements of these devices are able to be problematic in diagnostics medical after entering the body.
• With mass production the cost of neodymium magnets is a challenge,

Magnetic strength at its maximum – what affects it?

Holding force of 0 kg is a theoretical maximum value conducted under standard conditions:

• with the use of a yoke made of special test steel, ensuring full magnetic saturation
• possessing a thickness of at least 10 mm to avoid saturation
• with an polished touching surface
• without any insulating layer between the magnet and steel
• for force acting at a right angle (pull-off, not shear)
• in stable room temperature

Key elements affecting lifting force

Holding efficiency is affected by specific conditions, mainly (from priority):

• Distance – the presence of any layer (rust, dirt, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
• Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
• Metal type – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
• Plate texture – ground elements ensure maximum contact, which improves force. Rough surfaces weaken the grip.
• Thermal environment – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance {between} the magnet’s surface and the plate reduces the lifting capacity.