SM 32x200 [2xM8] / N52 - magnetic separator

Advantages as well as disadvantages of NdFeB magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• They have unchanged lifting capacity, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
• They retain their magnetic properties even under close interference source,
• By covering with a smooth layer of gold, the element presents an nice look,
• Magnets have very high magnetic induction on the outer side,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
• Due to the ability of free molding and customization to individualized needs, NdFeB magnets can be manufactured in a variety of shapes and sizes, which expands the range of possible applications,
• Huge importance in modern industrial fields – they are utilized in magnetic memories, electric drive systems, diagnostic systems, as well as multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in compact constructions

Drawbacks and weaknesses of neodymium magnets: tips and applications.

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
• When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
• We suggest casing - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
• Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these magnets are able to disrupt the diagnostic process medical after entering the body.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum magnetic pulling force – what affects it?

The force parameter is a theoretical maximum value executed under the following configuration:

• on a plate made of structural steel, effectively closing the magnetic flux
• possessing a massiveness of at least 10 mm to avoid saturation
• characterized by even structure
• without the slightest clearance between the magnet and steel
• during detachment in a direction perpendicular to the plane
• at standard ambient temperature

Magnet lifting force in use – key factors

Effective lifting capacity is influenced by specific conditions, mainly (from most important):

• Distance – existence of foreign body (rust, dirt, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
• Direction of force – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
• Base massiveness – too thin plate does not accept the full field, causing part of the power to be wasted to the other side.
• Steel grade – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
• Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
• Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the holding force is lower. Additionally, even a minimal clearance {between} the magnet’s surface and the plate lowers the load capacity.