BM 850x180x70 [4x M8] - magnetic beam

Pros as well as cons of neodymium magnets.

Besides their immense strength, neodymium magnets offer the following advantages:

• They have stable power, and over around ten years their performance decreases symbolically – ~1% (in testing),
• They are resistant to demagnetization induced by external magnetic fields,
• The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to look better,
• They feature high magnetic induction at the operating surface, making them more effective,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
• Thanks to freedom in designing and the capacity to customize to client solutions,
• Key role in future technologies – they are commonly used in HDD drives, motor assemblies, medical devices, as well as technologically advanced constructions.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages of NdFeB magnets:

• Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 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.
• Due to limitations in creating nuts and complex shapes in magnets, we recommend using cover - magnetic holder.
• Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these devices can complicate diagnosis medical in case of swallowing.
• With budget limitations the cost of neodymium magnets is economically unviable,

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

Magnet power is the result of a measurement for optimal configuration, taking into account:

• with the use of a yoke made of low-carbon steel, ensuring full magnetic saturation
• whose thickness reaches at least 10 mm
• characterized by smoothness
• without any air gap between the magnet and steel
• under vertical application of breakaway force (90-degree angle)
• at standard ambient temperature

Magnet lifting force in use – key factors

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

• Distance – the presence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Angle of force application – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
• Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Plate material – low-carbon steel gives the best results. Higher carbon content lower magnetic permeability and lifting capacity.
• Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
• Temperature influence – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate lowers the load capacity.