SM 25x125 [2xM8] / N52 - magnetic separator

Pros as well as cons of NdFeB magnets.

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

• They have stable power, and over around ten years their performance decreases symbolically – ~1% (in testing),
• Neodymium magnets are distinguished by highly resistant to loss of magnetic properties caused by external interference,
• A magnet with a metallic silver surface has an effective appearance,
• Magnets possess impressive magnetic induction on the outer layer,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Thanks to flexibility in forming and the capacity to adapt to complex applications,
• Huge importance in electronics industry – they are used in HDD drives, brushless drives, medical equipment, and technologically advanced constructions.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Problematic aspects of neodymium magnets: tips and applications.

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
• Due to limitations in creating nuts and complex forms in magnets, we propose using cover - magnetic mechanism.
• Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these products are able to complicate diagnosis medical when they are in the body.
• Due to neodymium price, their price exceeds standard values,

Maximum lifting force for a neodymium magnet – what contributes to it?

The force parameter is a measurement result executed under specific, ideal conditions:

• with the use of a yoke made of low-carbon steel, ensuring maximum field concentration
• with a cross-section no less than 10 mm
• characterized by even structure
• under conditions of gap-free contact (surface-to-surface)
• for force acting at a right angle (pull-off, not shear)
• in temp. approx. 20°C

Practical aspects of lifting capacity – factors

Bear in mind that the magnet holding will differ influenced by the following factors, starting with the most relevant:

• Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
• Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Chemical composition of the base – mild steel attracts best. Alloy admixtures decrease magnetic permeability and lifting capacity.
• Surface condition – ground elements guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
• Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, however under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance {between} the magnet and the plate reduces the holding force.