BM 750x180x70 [4x M8] - magnetic beam

Advantages and disadvantages of neodymium magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• Their power is durable, and after approximately 10 years it drops only by ~1% (theoretically),
• They possess excellent resistance to magnetic field loss when exposed to external fields,
• In other words, due to the smooth finish of gold, the element gains visual value,
• Neodymium magnets achieve maximum magnetic induction on a small surface, which allows for strong attraction,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures reaching 230°C and above...
• Possibility of precise creating and adjusting to complex conditions,
• Huge importance in modern technologies – they serve a role in hard drives, electric motors, precision medical tools, and modern systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Problematic aspects of neodymium magnets and proposals for their use:

• At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
• 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, as well as 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 secure oxidation as well as corrosion.
• Due to limitations in producing nuts and complex shapes in magnets, we propose using cover - magnetic mechanism.
• Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these devices are able to complicate diagnosis medical after entering the body.
• With large orders the cost of neodymium magnets is economically unviable,

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

The declared magnet strength represents the peak performance, measured under optimal environment, meaning:

• on a plate made of structural steel, effectively closing the magnetic flux
• possessing a thickness of min. 10 mm to avoid saturation
• with a plane free of scratches
• with direct contact (without impurities)
• under vertical force direction (90-degree angle)
• at ambient temperature room level

Magnet lifting force in use – key factors

Please note that the application force will differ influenced by elements below, starting with the most relevant:

• Gap (betwixt the magnet and the plate), since even a tiny distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Plate thickness – too thin steel does not accept the full field, causing part of the flux to be escaped into the air.
• Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content decrease magnetic permeability and holding force.
• Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
• Temperature – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet’s surface and the plate reduces the load capacity.