BM 950x180x70 [4x M8] - magnetic beam

Strengths as well as weaknesses of neodymium magnets.

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

• They do not lose power, even over approximately ten years – the drop in strength is only ~1% (theoretically),
• Neodymium magnets are distinguished by exceptionally resistant to loss of magnetic properties caused by external interference,
• In other words, due to the smooth surface of nickel, the element looks attractive,
• The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures approaching 230°C and above...
• Possibility of precise shaping as well as modifying to atypical needs,
• Universal use in innovative solutions – they are commonly used in data components, electromotive mechanisms, precision medical tools, and multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in compact constructions

Drawbacks and weaknesses of neodymium magnets: application proposals

• At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (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. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in realizing nuts and complicated shapes in magnets, we propose using casing - magnetic mechanism.
• Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can be problematic in diagnostics medical when they are in the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting force for a neodymium magnet – what affects it?

The specified lifting capacity represents the peak performance, recorded under laboratory conditions, specifically:

• on a plate made of mild steel, effectively closing the magnetic field
• possessing a massiveness of at least 10 mm to avoid saturation
• with an ideally smooth touching surface
• with total lack of distance (no impurities)
• during detachment in a direction perpendicular to the mounting surface
• at temperature room level

What influences lifting capacity in practice

Please note that the application force may be lower depending on the following factors, in order of importance:

• Gap (between the magnet and the plate), as even a very small distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
• Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
• Material type – the best choice is high-permeability steel. Cast iron may attract less.
• Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces weaken the grip.
• Thermal environment – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the holding force is lower. In addition, even a small distance {between} the magnet’s surface and the plate lowers the lifting capacity.