BM 450x180x70 [4x M8] - magnetic beam

Strengths as well as weaknesses of neodymium magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

• They do not lose magnetism, even over nearly 10 years – the drop in lifting capacity is only ~1% (based on measurements),
• Neodymium magnets are remarkably resistant to demagnetization caused by external interference,
• Thanks to the reflective finish, the surface of Ni-Cu-Ni, gold, or silver gives an modern appearance,
• Magnets are distinguished by huge magnetic induction on the surface,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Thanks to versatility in shaping and the ability to customize to unusual requirements,
• Wide application in innovative solutions – they are commonly used in hard drives, electromotive mechanisms, medical equipment, and technologically advanced constructions.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Drawbacks and weaknesses of neodymium magnets: tips and applications.

• 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 suffer a drop in force. 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
• Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in producing threads and complex forms in magnets, we propose using a housing - magnetic mount.
• Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these products can complicate diagnosis medical after entering the body.
• Due to complex production process, their price is higher than average,

Maximum lifting capacity of the magnet – what affects it?

The load parameter shown concerns the limit force, obtained under laboratory conditions, meaning:

• using a sheet made of mild steel, serving as a circuit closing element
• whose thickness reaches at least 10 mm
• characterized by smoothness
• without any insulating layer between the magnet and steel
• during detachment in a direction vertical to the plane
• in stable room temperature

Lifting capacity in practice – influencing factors

Please note that the application force may be lower subject to the following factors, starting with the most relevant:

• Distance – existence of foreign body (rust, dirt, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
• Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
• Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
• Surface quality – the more even the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
• Thermal environment – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a slight gap {between} the magnet and the plate decreases the holding force.