BM 380x180x70 [4x M8] - magnetic beam

Advantages as well as disadvantages of rare earth magnets.

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

• They have stable power, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
• They have excellent resistance to magnetism drop when exposed to opposing magnetic fields,
• In other words, due to the smooth surface of gold, the element gains a professional look,
• Magnets have maximum magnetic induction on the outer side,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
• Due to the ability of precise shaping and customization to individualized requirements, magnetic components can be manufactured in a variety of geometric configurations, which increases their versatility,
• Significant place in innovative solutions – they are used in data components, electromotive mechanisms, diagnostic systems, and complex engineering applications.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Limited possibility of creating threads in the magnet and complicated shapes - recommended is casing - mounting mechanism.
• Potential hazard to health – tiny shards of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these products can be problematic in diagnostics medical after entering the body.
• Due to neodymium price, their price exceeds standard values,

Magnetic strength at its maximum – what affects it?

The load parameter shown concerns the maximum value, obtained under optimal environment, meaning:

• on a block made of mild steel, effectively closing the magnetic flux
• whose thickness is min. 10 mm
• characterized by lack of roughness
• under conditions of ideal adhesion (surface-to-surface)
• during detachment in a direction perpendicular to the mounting surface
• at temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

Please note that the magnet holding may be lower influenced by the following factors, in order of importance:

• Distance (betwixt the magnet and the metal), as even a very small distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
• Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
• Base massiveness – too thin steel causes magnetic saturation, causing part of the power to be escaped into the air.
• Chemical composition of the base – mild steel gives the best results. Alloy admixtures reduce magnetic permeability and holding force.
• Base smoothness – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
• Thermal factor – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, in contrast under parallel forces the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate lowers the holding force.