UMP 97x40 [M8+M10] GW F300 kg / N38 - search holder

Pros as well as cons of NdFeB magnets.

Apart from their notable magnetic energy, neodymium magnets have these key benefits:

• They have stable power, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
• Neodymium magnets prove to be remarkably resistant to magnetic field loss caused by magnetic disturbances,
• Thanks to the shimmering finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an elegant appearance,
• The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Thanks to the potential of precise molding and adaptation to individualized projects, magnetic components can be produced in a wide range of shapes and sizes, which expands the range of possible applications,
• Versatile presence in modern industrial fields – they find application in HDD drives, electric motors, advanced medical instruments, as well as other advanced devices.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Characteristics of disadvantages of neodymium magnets and proposals for their use:

• They are prone to damage upon heavy 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
• Neodymium magnets decrease their power 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
• They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Limited possibility of creating nuts in the magnet and complex forms - recommended is casing - magnet mounting.
• Health risk related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Additionally, tiny parts of these products can complicate diagnosis medical in case of swallowing.
• Due to complex production process, their price exceeds standard values,

Maximum lifting capacity of the magnet – what it depends on?

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

• using a base made of mild steel, functioning as a ideal flux conductor
• with a thickness minimum 10 mm
• with a plane perfectly flat
• under conditions of no distance (metal-to-metal)
• during detachment in a direction perpendicular to the mounting surface
• at conditions approx. 20°C

Lifting capacity in practice – influencing factors

Please note that the working load will differ depending on elements below, in order of importance:

• Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Steel thickness – insufficiently thick plate does not accept the full field, causing part of the flux to be wasted to the other side.
• Plate material – low-carbon steel attracts best. Alloy steels lower magnetic properties and holding force.
• Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
• Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

* Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the holding force is lower. In addition, even a small distance {between} the magnet and the plate lowers the lifting capacity.