BM 950x180x70 [4x M8] - magnetic beam

Strengths as well as weaknesses of neodymium magnets.

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

• They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
• They have excellent resistance to magnetism drop due to external fields,
• Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an aesthetic appearance,
• They show high magnetic induction at the operating surface, which improves attraction properties,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
• In view of the potential of free molding and customization to custom projects, magnetic components can be produced in a broad palette of shapes and sizes, which makes them more universal,
• Fundamental importance in modern technologies – they are utilized in data components, motor assemblies, medical equipment, also multitasking production systems.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Problematic aspects of neodymium magnets: weaknesses and usage proposals

• At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
• Due to limitations in producing threads and complex shapes in magnets, we recommend using cover - magnetic mount.
• Health risk to health – tiny shards of magnets are risky, if swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Magnetic strength at its maximum – what it depends on?

The load parameter shown refers to the limit force, recorded under optimal environment, meaning:

• on a base made of mild steel, optimally conducting the magnetic field
• possessing a thickness of at least 10 mm to ensure full flux closure
• characterized by even structure
• without the slightest air gap between the magnet and steel
• during detachment in a direction perpendicular to the plane
• in stable room temperature

Magnet lifting force in use – key factors

In real-world applications, the real power is determined by several key aspects, presented from crucial:

• Clearance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
• Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
• Steel type – mild steel attracts best. Alloy admixtures reduce magnetic permeability and lifting capacity.
• Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
• Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate reduces the load capacity.