BM 550x180x70 [4x M8] - magnetic beam

Advantages and disadvantages of NdFeB magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• Their power is maintained, and after approximately ten years it drops only by ~1% (theoretically),
• They have excellent resistance to magnetism drop due to external magnetic sources,
• By covering with a smooth layer of silver, the element has an aesthetic look,
• Magnets possess exceptionally strong magnetic induction on the surface,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
• In view of the potential of precise shaping and customization to individualized projects, neodymium magnets can be created in a broad palette of shapes and sizes, which amplifies use scope,
• Wide application in innovative solutions – they are utilized in data components, motor assemblies, advanced medical instruments, as well as other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in compact constructions

What to avoid - cons of neodymium magnets and ways of using them

• 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 raises their durability
• NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Limited ability of creating nuts in the magnet and complicated shapes - recommended is a housing - magnetic holder.
• Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these products are able to disrupt the diagnostic process medical after entering the body.
• With budget limitations the cost of neodymium magnets can be a barrier,

Highest magnetic holding force – what contributes to it?

Holding force of 0 kg is a theoretical maximum value conducted under the following configuration:

• using a base made of mild steel, serving as a circuit closing element
• whose thickness reaches at least 10 mm
• characterized by even structure
• without any air gap between the magnet and steel
• under perpendicular force direction (90-degree angle)
• at temperature room level

Key elements affecting lifting force

It is worth knowing that the application force may be lower influenced by the following factors, starting with the most relevant:

• Air gap (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, rust or debris).
• Direction of force – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
• Steel grade – the best choice is high-permeability steel. Cast iron may attract less.
• Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
• Temperature influence – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.