MW 29x10 / N38 - cylindrical magnet

Strengths as well as weaknesses of neodymium magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They have constant strength, and over around ten years their performance decreases symbolically – ~1% (according to theory),
• They possess excellent resistance to magnetism drop as a result of external magnetic sources,
• By covering with a lustrous layer of silver, the element presents an professional look,
• The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Considering the ability of precise forming and customization to unique solutions, NdFeB magnets can be manufactured in a wide range of forms and dimensions, which expands the range of possible applications,
• Wide application in innovative solutions – they find application in magnetic memories, brushless drives, medical equipment, also complex engineering applications.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons of neodymium magnets: weaknesses and usage proposals

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• We recommend a housing - magnetic mount, due to difficulties in producing nuts inside the magnet and complex shapes.
• Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. It is also worth noting that tiny parts of these devices can complicate diagnosis medical in case of swallowing.
• Due to expensive raw materials, their price exceeds standard values,

Highest magnetic holding force – what contributes to it?

The specified lifting capacity refers to the maximum value, measured under laboratory conditions, meaning:

• using a sheet made of low-carbon steel, acting as a magnetic yoke
• whose thickness equals approx. 10 mm
• with a plane free of scratches
• without any clearance between the magnet and steel
• for force acting at a right angle (pull-off, not shear)
• at conditions approx. 20°C

Key elements affecting lifting force

Please note that the application force may be lower influenced by the following factors, starting with the most relevant:

• Distance (betwixt the magnet and the metal), as even a tiny clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
• Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
• Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
• Material type – the best choice is pure iron steel. Cast iron may attract less.
• Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
• Temperature influence – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a small distance {between} the magnet and the plate reduces the lifting capacity.