KM HF - 11,3 kg - magnetic bracket

Advantages and disadvantages of NdFeB magnets.

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

• They do not lose strength, even after approximately 10 years – the drop in power is only ~1% (theoretically),
• They maintain their magnetic properties even under external field action,
• A magnet with a shiny nickel surface has better aesthetics,
• Magnets are distinguished by impressive magnetic induction on the outer layer,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
• Possibility of precise creating and modifying to defined requirements,
• Universal use in electronics industry – they serve a role in HDD drives, motor assemblies, advanced medical instruments, as well as multitasking production systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

What to avoid - cons of neodymium magnets: tips and applications.

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
• Limited ability of producing nuts in the magnet and complicated shapes - preferred is a housing - mounting mechanism.
• Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these devices can complicate diagnosis medical when they are in the body.
• With large orders the cost of neodymium magnets can be a barrier,

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Magnet power was determined for optimal configuration, assuming:

• using a sheet made of low-carbon steel, serving as a ideal flux conductor
• with a cross-section no less than 10 mm
• characterized by smoothness
• under conditions of no distance (surface-to-surface)
• during detachment in a direction perpendicular to the mounting surface
• in neutral thermal conditions

Lifting capacity in real conditions – factors

Bear in mind that the working load may be lower subject to the following factors, in order of importance:

• Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
• Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
• Chemical composition of the base – low-carbon steel attracts best. Alloy steels lower magnetic permeability and lifting capacity.
• Base smoothness – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
• Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was determined by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap {between} the magnet’s surface and the plate reduces the holding force.