SM 32x150 [2xM8] / N42 - magnetic separator

Strengths and weaknesses of NdFeB magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They have stable power, and over around ten years their performance decreases symbolically – ~1% (in testing),
• Magnets perfectly defend themselves against demagnetization caused by ambient magnetic noise,
• In other words, due to the metallic finish of silver, the element gains a professional look,
• The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
• 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 versatility in constructing and the capacity to adapt to client solutions,
• Significant place in innovative solutions – they serve a role in mass storage devices, electric motors, advanced medical instruments, as well as complex engineering applications.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
• When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power 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. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
• We suggest cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
• Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these products can be problematic in diagnostics medical in case of swallowing.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Optimal lifting capacity of a neodymium magnet – what it depends on?

Magnet power was defined for ideal contact conditions, including:

• using a plate made of low-carbon steel, serving as a circuit closing element
• with a cross-section no less than 10 mm
• with a plane free of scratches
• under conditions of no distance (surface-to-surface)
• during detachment in a direction vertical to the plane
• in stable room temperature

Magnet lifting force in use – key factors

Effective lifting capacity impacted by working environment parameters, such as (from most important):

• Clearance – the presence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
• Material composition – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
• Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
• Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was determined with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the holding force is lower. In addition, even a minimal clearance {between} the magnet and the plate decreases the holding force.