UMP 75x25 [M10x3] GW F200 PLATINIUM / N52 - search holder

Strengths and weaknesses of NdFeB magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• Their magnetic field is durable, and after around 10 years it drops only by ~1% (theoretically),
• They show high resistance to demagnetization induced by external magnetic fields,
• In other words, due to the shiny finish of gold, the element is aesthetically pleasing,
• Magnetic induction on the surface 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...
• Possibility of custom modeling and adjusting to defined conditions,
• Key role in modern industrial fields – they are used in computer drives, electric motors, diagnostic systems, and other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in miniature devices

Problematic aspects of neodymium magnets and proposals for their use:

• To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
• Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 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 resistant to moisture, when using outdoors
• We recommend casing - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated forms.
• Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small elements of these devices are able to complicate diagnosis medical in case of swallowing.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum magnetic pulling force – what it depends on?

Information about lifting capacity was determined for optimal configuration, assuming:

• on a block made of structural steel, optimally conducting the magnetic flux
• possessing a thickness of minimum 10 mm to ensure full flux closure
• with a plane free of scratches
• under conditions of gap-free contact (surface-to-surface)
• under axial force vector (90-degree angle)
• at standard ambient temperature

What influences lifting capacity in practice

During everyday use, the real power is determined by several key aspects, ranked from crucial:

• Clearance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
• Steel type – mild steel gives the best results. Alloy steels decrease magnetic permeability and lifting capacity.
• Smoothness – full contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
• Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.