MW 12x1 / N38 - cylindrical magnet

Pros as well as cons of neodymium magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

• They do not lose power, even after nearly ten years – the drop in lifting capacity is only ~1% (based on measurements),
• They possess excellent resistance to magnetic field loss due to external magnetic sources,
• By using a shiny coating of gold, the element gains an professional look,
• Magnetic induction on the working part of the magnet is exceptional,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• In view of the potential of free forming and adaptation to unique solutions, NdFeB magnets can be produced in a variety of shapes and sizes, which increases their versatility,
• Key role in innovative solutions – they are used in magnetic memories, brushless drives, precision medical tools, as well as other advanced devices.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

What to avoid - cons of neodymium magnets: weaknesses and usage proposals

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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
• Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• We recommend casing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated forms.
• Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Additionally, small elements of these products can disrupt the diagnostic process medical when they are in the body.
• Due to complex production process, their price exceeds standard values,

Maximum magnetic pulling force – what affects it?

Magnet power was determined for optimal configuration, taking into account:

• on a base made of structural steel, effectively closing the magnetic field
• whose thickness equals approx. 10 mm
• characterized by lack of roughness
• under conditions of ideal adhesion (surface-to-surface)
• under axial force direction (90-degree angle)
• at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the application force will differ depending on elements below, starting with the most relevant:

• Distance – the presence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
• Angle of force application – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
• Steel thickness – too thin steel does not close the flux, causing part of the power to be lost into the air.
• Material type – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
• Surface finish – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
• Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.