BM 320x180x70 [4x M8] - magnetic beam

Advantages and disadvantages of neodymium magnets.

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

• They retain full power for almost 10 years – the drop is just ~1% (based on simulations),
• They are extremely resistant to demagnetization induced by external disturbances,
• The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to present itself better,
• They feature high magnetic induction at the operating surface, which affects their effectiveness,
• Neodymium magnets are known for very high magnetic induction and the ability to work at temperatures up to 230°C or higher (depending on the geometry),
• Due to the potential of free forming and adaptation to individualized needs, NdFeB magnets can be modeled in a variety of forms and dimensions, which amplifies use scope,
• Significant place in modern technologies – they are commonly used in hard drives, electric motors, advanced medical instruments, as well as other advanced devices.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also increases their durability
• Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. 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 immune to moisture, in case of application outdoors
• We recommend cover - magnetic holder, due to difficulties in producing threads inside the magnet and complex shapes.
• Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these devices are able to complicate diagnosis medical in case of swallowing.
• Due to complex production process, their price is higher than average,

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

The load parameter shown represents the maximum value, obtained under optimal environment, namely:

• on a plate made of structural steel, optimally conducting the magnetic field
• with a thickness minimum 10 mm
• with an ground touching surface
• with total lack of distance (without paint)
• for force acting at a right angle (pull-off, not shear)
• at ambient temperature room level

Practical lifting capacity: influencing factors

Bear in mind that the magnet holding will differ depending on the following factors, starting with the most relevant:

• Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
• Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
• Plate thickness – insufficiently thick steel does not close the flux, causing part of the flux to be wasted into the air.
• Metal type – not every steel attracts identically. High carbon content weaken the attraction effect.
• Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
• Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, whereas under parallel forces the lifting capacity is smaller. Moreover, even a small distance {between} the magnet and the plate reduces the load capacity.