BM 950x180x70 [4x M8] - magnetic beam

Pros as well as cons of neodymium magnets.

Besides their immense magnetic power, neodymium magnets offer the following advantages:

• Their magnetic field is maintained, and after around 10 years it drops only by ~1% (theoretically),
• They do not lose their magnetic properties even under strong external field,
• The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to present itself better,
• They feature high magnetic induction at the operating surface, making them more effective,
• Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
• Due to the ability of accurate shaping and adaptation to individualized solutions, NdFeB magnets can be produced in a wide range of forms and dimensions, which amplifies use scope,
• Wide application in innovative solutions – they find application in magnetic memories, electric motors, medical devices, and other advanced devices.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets: application proposals

• To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
• Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
• We suggest a housing - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
• Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

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

Holding force of 0 kg is a measurement result executed under the following configuration:

• using a plate made of low-carbon steel, acting as a magnetic yoke
• possessing a thickness of min. 10 mm to avoid saturation
• characterized by even structure
• under conditions of no distance (metal-to-metal)
• under vertical application of breakaway force (90-degree angle)
• at temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

During everyday use, the actual holding force results from several key aspects, ranked from the most important:

• Gap (between the magnet and the plate), as even a very small clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
• Material composition – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
• Surface condition – smooth surfaces ensure maximum contact, which increases force. Rough surfaces weaken the grip.
• Thermal environment – temperature increase results in weakening of induction. Check the thermal limit for a given model.

* Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the holding force is lower. Additionally, even a small distance {between} the magnet’s surface and the plate decreases the holding force.