NCM 40x13.5x5 / N38 - channel magnetic holder

Advantages as well as disadvantages of rare earth magnets.

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:

• They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (in laboratory conditions),
• Neodymium magnets are extremely resistant to demagnetization caused by external magnetic fields,
• The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
• They feature high magnetic induction at the operating surface, which increases their power,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
• Considering the possibility of free forming and customization to custom needs, NdFeB magnets can be produced in a wide range of shapes and sizes, which amplifies use scope,
• Huge importance in modern technologies – they are used in magnetic memories, drive modules, diagnostic systems, and industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in compact constructions

Disadvantages of NdFeB magnets:

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest 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 creating nuts and complex shapes in magnets, we propose using casing - magnetic holder.
• Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these devices can disrupt the diagnostic process medical after entering the body.
• With budget limitations the cost of neodymium magnets is economically unviable,

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

The lifting capacity listed is a measurement result performed under specific, ideal conditions:

• with the use of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
• whose thickness reaches at least 10 mm
• characterized by even structure
• without the slightest insulating layer between the magnet and steel
• during detachment in a direction perpendicular to the plane
• at temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Please note that the working load may be lower influenced by elements below, starting with the most relevant:

• Distance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Load vector – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
• Material type – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
• Surface finish – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
• Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet’s surface and the plate decreases the load capacity.