BM 850x180x70 [4x M8] - magnetic beam

Pros as well as cons of rare earth magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• Their strength is maintained, and after approximately ten years it drops only by ~1% (according to research),
• Neodymium magnets remain remarkably resistant to demagnetization caused by magnetic disturbances,
• The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
• Magnetic induction on the surface of the magnet is exceptional,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
• Thanks to the ability of precise shaping and adaptation to individualized requirements, magnetic components can be modeled in a variety of forms and dimensions, which expands the range of possible applications,
• Significant place in modern industrial fields – they find application in magnetic memories, drive modules, diagnostic systems, and technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems

Disadvantages of NdFeB magnets:

• At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and 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
• They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• We suggest cover - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated forms.
• Possible danger to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. Furthermore, small components of these products can disrupt the diagnostic process medical after entering the body.
• With large orders the cost of neodymium magnets is economically unviable,

Breakaway strength of the magnet in ideal conditions – what affects it?

Holding force of 0 kg is a result of laboratory testing conducted under the following configuration:

• using a sheet made of high-permeability steel, acting as a magnetic yoke
• with a cross-section no less than 10 mm
• with an ideally smooth touching surface
• without the slightest clearance between the magnet and steel
• for force applied at a right angle (in the magnet axis)
• at ambient temperature room level

Magnet lifting force in use – key factors

Bear in mind that the magnet holding will differ influenced by elements below, starting with the most relevant:

• Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens 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 drastically, often to levels of 20-30% of the maximum value.
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Steel type – low-carbon steel attracts best. Alloy admixtures reduce magnetic permeability and lifting capacity.
• Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
• Thermal environment – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under parallel forces the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate lowers the holding force.