BM 550x180x70 [4x M8] - magnetic beam

Strengths as well as weaknesses of NdFeB magnets.

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

• They have constant strength, and over around ten years their performance decreases symbolically – ~1% (according to theory),
• Neodymium magnets are characterized by extremely resistant to loss of magnetic properties caused by magnetic disturbances,
• Thanks to the shimmering finish, the surface of Ni-Cu-Ni, gold, or silver gives an elegant appearance,
• Magnetic induction on the working part of the magnet turns out to be strong,
• 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 accurate shaping and adjusting to atypical needs,
• Fundamental importance in modern industrial fields – they are commonly used in computer drives, drive modules, medical equipment, and multitasking production systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Problematic aspects of neodymium magnets: tips and applications.

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
• When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding 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 stable to moisture, when using outdoors
• We suggest cover - magnetic mount, due to difficulties in realizing threads inside the magnet and complicated forms.
• Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
• With large orders the cost of neodymium magnets is a challenge,

Highest magnetic holding force – what affects it?

The lifting capacity listed is a measurement result performed under the following configuration:

• on a plate made of mild steel, optimally conducting the magnetic flux
• whose thickness is min. 10 mm
• with a surface free of scratches
• under conditions of no distance (metal-to-metal)
• for force acting at a right angle (in the magnet axis)
• at ambient temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

During everyday use, the actual lifting capacity is determined by a number of factors, presented from crucial:

• Gap (between the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
• Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
• Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Temperature influence – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under shearing force the holding force is lower. In addition, even a slight gap {between} the magnet and the plate decreases the holding force.