MW 6x6 / N38 - cylindrical magnet

Pros and cons of neodymium magnets.

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

• Their magnetic field is durable, and after around 10 years it decreases only by ~1% (according to research),
• They do not lose their magnetic properties even under external field action,
• In other words, due to the glossy finish of gold, the element looks attractive,
• Neodymium magnets create maximum magnetic induction on a their surface, which ensures high operational effectiveness,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
• Possibility of precise machining and adjusting to specific needs,
• Versatile presence in innovative solutions – they are used in mass storage devices, electric motors, medical devices, as well as multitasking production systems.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

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

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. 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.
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
• Due to limitations in producing nuts and complex shapes in magnets, we propose using casing - magnetic holder.
• Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products 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

Highest magnetic holding force – what it depends on?

The declared magnet strength concerns the limit force, measured under laboratory conditions, namely:

• on a block made of mild steel, optimally conducting the magnetic field
• whose transverse dimension is min. 10 mm
• with a surface free of scratches
• with direct contact (without impurities)
• during pulling in a direction vertical to the mounting surface
• at ambient temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Please note that the magnet holding may be lower depending on elements below, starting with the most relevant:

• Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
• Direction of force – highest force is obtained only during perpendicular pulling. The shear force of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
• Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
• Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content lower magnetic permeability and holding force.
• Smoothness – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
• Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was measured with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the lifting capacity is smaller. In addition, even a small distance {between} the magnet and the plate lowers the lifting capacity.