UMP 75x25 [M10x3] GW F200 GOLD Lina / N42 - search holder

Pros as well as cons of NdFeB magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• They have stable power, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
• Neodymium magnets are exceptionally resistant to loss of magnetic properties caused by external field sources,
• A magnet with a metallic silver surface has an effective appearance,
• They show high magnetic induction at the operating surface, which improves attraction properties,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures approaching 230°C and above...
• Possibility of individual machining as well as adapting to concrete needs,
• Significant place in advanced technology sectors – they are used in computer drives, brushless drives, medical devices, also other advanced devices.
• Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Cons of neodymium magnets: tips and applications.

• 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 lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• We recommend casing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated forms.
• Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
• With large orders the cost of neodymium magnets is a challenge,

Maximum lifting capacity of the magnet – what it depends on?

The declared magnet strength represents the peak performance, obtained under ideal test conditions, namely:

• with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
• whose transverse dimension reaches at least 10 mm
• with a surface cleaned and smooth
• with zero gap (no coatings)
• under perpendicular application of breakaway force (90-degree angle)
• at ambient temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

In practice, the actual holding force is determined by many variables, presented from crucial:

• Gap (between the magnet and the plate), because even a tiny distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
• Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
• Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Material type – ideal substrate is high-permeability steel. Hardened steels may attract less.
• Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
• Thermal factor – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a small distance {between} the magnet’s surface and the plate lowers the lifting capacity.