BM 320x180x70 [4x M8] - magnetic beam

Strengths as well as weaknesses of rare earth magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• Their magnetic field remains stable, and after approximately ten years it drops only by ~1% (theoretically),
• They retain their magnetic properties even under external field action,
• By applying a decorative coating of silver, the element presents an modern look,
• Magnetic induction on the surface of the magnet remains impressive,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Due to the option of free shaping and customization to specialized projects, magnetic components can be created in a wide range of forms and dimensions, which expands the range of possible applications,
• Universal use in modern technologies – they serve a role in magnetic memories, electromotive mechanisms, medical devices, and modern systems.
• Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. 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 power. 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
• They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• We suggest casing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated forms.
• Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these products can be problematic in diagnostics medical after entering the body.
• With mass production the cost of neodymium magnets is economically unviable,

Maximum holding power of the magnet – what affects it?

Holding force of 0 kg is a theoretical maximum value executed under specific, ideal conditions:

• on a base made of mild steel, perfectly concentrating the magnetic field
• possessing a massiveness of at least 10 mm to avoid saturation
• with an ideally smooth touching surface
• without any clearance between the magnet and steel
• under perpendicular application of breakaway force (90-degree angle)
• at room temperature

Key elements affecting lifting force

Real force is affected by working environment parameters, mainly (from priority):

• Clearance – existence of any layer (rust, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Load vector – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
• Base massiveness – too thin steel causes magnetic saturation, causing part of the power to be lost to the other side.
• Plate material – mild steel attracts best. Alloy admixtures lower magnetic properties and lifting capacity.
• Surface quality – the more even the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
• Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the holding force is lower. In addition, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.