KM HF - 22 kg - magnetic bracket

Pros as well as cons of rare earth magnets.

Apart from their consistent holding force, neodymium magnets have these key benefits:

• They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
• They maintain their magnetic properties even under external field action,
• By using a shiny coating of silver, the element acquires an proper look,
• Magnetic induction on the working layer of the magnet is extremely intense,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
• Thanks to modularity in constructing and the capacity to customize to complex applications,
• Significant place in electronics industry – they are commonly used in hard drives, brushless drives, diagnostic systems, as well as complex engineering applications.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

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

• At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
• We recommend a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex forms.
• Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these devices can be problematic in diagnostics medical after entering the body.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Magnetic strength at its maximum – what affects it?

Magnet power was determined for ideal contact conditions, taking into account:

• with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
• whose thickness equals approx. 10 mm
• characterized by even structure
• with zero gap (without paint)
• during detachment in a direction perpendicular to the mounting surface
• in stable room temperature

Lifting capacity in real conditions – factors

In real-world applications, the actual holding force is determined by many variables, presented from crucial:

• Air gap (betwixt the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, corrosion or debris).
• Angle of force application – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
• Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
• Material type – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
• Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
• Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance {between} the magnet and the plate reduces the lifting capacity.