SMZR 25x100 / N52 - magnetic separator with handle

Pros and cons of NdFeB magnets.

Besides their exceptional pulling force, neodymium magnets offer the following advantages:

• They have unchanged lifting capacity, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
• They have excellent resistance to magnetism drop as a result of external magnetic sources,
• A magnet with a smooth gold surface has better aesthetics,
• Magnets are characterized by maximum magnetic induction on the active area,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of individual machining as well as optimizing to precise needs,
• Wide application in modern technologies – they serve a role in computer drives, motor assemblies, advanced medical instruments, and complex engineering applications.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets: tips and applications.

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
• Due to limitations in creating threads and complicated shapes in magnets, we recommend using a housing - magnetic mount.
• Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Additionally, small elements of these products can disrupt the diagnostic process medical when they are in the body.
• With large orders the cost of neodymium magnets can be a barrier,

Detachment force of the magnet in optimal conditions – what contributes to it?

Magnet power is the result of a measurement for optimal configuration, assuming:

• using a plate made of mild steel, functioning as a magnetic yoke
• with a cross-section of at least 10 mm
• characterized by lack of roughness
• under conditions of ideal adhesion (metal-to-metal)
• during detachment in a direction vertical to the plane
• at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

In practice, the real power depends on a number of factors, listed from crucial:

• Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
• Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
• Plate material – low-carbon steel gives the best results. Alloy admixtures decrease magnetic properties and holding force.
• Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
• Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet and the plate decreases the load capacity.