SM 32x350 [2xM8] / N52 - magnetic separator

Pros and cons of neodymium magnets.

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:

• They do not lose power, even during nearly ten years – the decrease in power is only ~1% (according to tests),
• They are resistant to demagnetization induced by external field influence,
• By using a reflective layer of gold, the element has an aesthetic look,
• Magnets have extremely high magnetic induction on the working surface,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• In view of the possibility of precise forming and adaptation to specialized projects, NdFeB magnets can be modeled in a wide range of forms and dimensions, which makes them more universal,
• Wide application in future technologies – they are commonly used in data components, electric motors, precision medical tools, also complex engineering applications.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Problematic aspects of neodymium magnets and ways of using them

• At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (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 start to 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.
• We recommend a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex shapes.
• Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
• With budget limitations the cost of neodymium magnets can be a barrier,

Detachment force of the magnet in optimal conditions – what it depends on?

The load parameter shown refers to the maximum value, measured under optimal environment, specifically:

• with the contact of a sheet made of special test steel, guaranteeing maximum field concentration
• with a thickness of at least 10 mm
• with an ground touching surface
• with direct contact (no coatings)
• during pulling in a direction vertical to the plane
• at ambient temperature room level

Determinants of lifting force in real conditions

During everyday use, the real power results from a number of factors, listed from crucial:

• Distance – existence of foreign body (paint, dirt, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
• Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
• Steel type – low-carbon steel attracts best. Alloy admixtures lower magnetic properties and holding force.
• Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
• Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet’s surface and the plate reduces the lifting capacity.