BM 450x180x70 [4x M8] - magnetic beam

Advantages and disadvantages of neodymium magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

• Their strength is maintained, and after around ten years it decreases only by ~1% (according to research),
• Neodymium magnets are distinguished by exceptionally resistant to loss of magnetic properties caused by external interference,
• In other words, due to the shiny layer of nickel, the element is aesthetically pleasing,
• Magnetic induction on the working part of the magnet turns out to be exceptional,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to the potential of free molding and customization to individualized requirements, neodymium magnets can be modeled in a wide range of shapes and sizes, which expands the range of possible applications,
• Huge importance in innovative solutions – they serve a role in computer drives, motor assemblies, diagnostic systems, and multitasking production systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons of neodymium magnets: application proposals

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
• Neodymium 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 extremely resistant to heat
• Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in creating nuts and complex shapes in magnets, we propose using cover - magnetic holder.
• Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that small components of these devices can complicate diagnosis medical when they are in the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting capacity of the magnet – what affects it?

Holding force of 0 kg is a theoretical maximum value performed under standard conditions:

• on a base made of mild steel, perfectly concentrating the magnetic flux
• whose thickness equals approx. 10 mm
• with an polished touching surface
• without the slightest insulating layer between the magnet and steel
• during detachment in a direction perpendicular to the mounting surface
• in temp. approx. 20°C

Practical lifting capacity: influencing factors

During everyday use, the actual lifting capacity depends on several key aspects, listed from most significant:

• Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
• Angle of force application – maximum parameter is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
• Base massiveness – too thin plate does not close the flux, causing part of the power to be lost into the air.
• Material composition – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
• Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
• Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet and the plate reduces the holding force.