MW 5x30 / N38 - cylindrical magnet

Advantages as well as disadvantages of NdFeB magnets.

Besides their remarkable pulling force, neodymium magnets offer the following advantages:

• They do not lose power, even over nearly ten years – the decrease in power is only ~1% (based on measurements),
• Neodymium magnets are characterized by remarkably resistant to loss of magnetic properties caused by external field sources,
• In other words, due to the shiny finish of silver, the element is aesthetically pleasing,
• They show high magnetic induction at the operating surface, which improves attraction properties,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Possibility of accurate shaping and adjusting to individual needs,
• Fundamental importance in modern industrial fields – they are utilized in magnetic memories, electric drive systems, diagnostic systems, as well as modern systems.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions

Drawbacks and weaknesses of neodymium magnets: application proposals

• They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest 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
• We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex forms.
• Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Additionally, small components of these magnets can complicate diagnosis medical after entering the body.
• With large orders the cost of neodymium magnets is a challenge,

Maximum lifting force for a neodymium magnet – what affects it?

Holding force of 8.29 kg is a theoretical maximum value conducted under specific, ideal conditions:

• using a plate made of high-permeability steel, serving as a ideal flux conductor
• whose thickness equals approx. 10 mm
• with a surface perfectly flat
• without any insulating layer between the magnet and steel
• during pulling in a direction perpendicular to the plane
• at ambient temperature room level

Key elements affecting lifting force

Effective lifting capacity is influenced by working environment parameters, such as (from priority):

• Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
• Load vector – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
• Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
• Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
• Thermal environment – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was measured with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet and the plate lowers the holding force.