MW 38x15 / N38 - cylindrical magnet

Pros as well as cons of neodymium magnets.

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

• Their power is maintained, and after approximately 10 years it drops only by ~1% (theoretically),
• Neodymium magnets prove to be exceptionally resistant to magnetic field loss caused by external field sources,
• Thanks to the elegant finish, the plating of nickel, gold, or silver-plated gives an elegant appearance,
• The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
• 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...
• Thanks to modularity in forming and the ability to customize to client solutions,
• Universal use in future technologies – they serve a role in HDD drives, motor assemblies, diagnostic systems, as well as industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in miniature devices

Disadvantages of NdFeB magnets:

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. 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 drop 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 extremely resistant to heat
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
• Limited ability of creating nuts in the magnet and complicated forms - preferred is a housing - magnetic holder.
• Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
• With large orders the cost of neodymium magnets is a challenge,

Best holding force of the magnet in ideal parameters – what contributes to it?

Breakaway force was determined for ideal contact conditions, including:

• on a plate made of structural steel, optimally conducting the magnetic flux
• possessing a thickness of minimum 10 mm to avoid saturation
• with an ground contact surface
• with zero gap (no impurities)
• during pulling in a direction perpendicular to the mounting surface
• at room temperature

Key elements affecting lifting force

Bear in mind that the working load will differ influenced by the following factors, in order of importance:

• Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Direction of force – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
• Steel thickness – too thin sheet does not accept the full field, causing part of the flux to be escaped to the other side.
• Steel type – low-carbon steel attracts best. Higher carbon content lower magnetic properties and holding force.
• Surface quality – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
• Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate reduces the lifting capacity.