AM ucho [M12] - magnetic accessories

Advantages and disadvantages of rare earth magnets.

Besides their exceptional pulling force, neodymium magnets offer the following advantages:

• They have unchanged lifting capacity, and over around ten years their attraction force decreases symbolically – ~1% (according to theory),
• Magnets effectively resist against loss of magnetization caused by foreign field sources,
• In other words, due to the glossy layer of gold, the element becomes visually attractive,
• They show high magnetic induction at the operating surface, making them more effective,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Thanks to modularity in forming and the capacity to customize to complex applications,
• Fundamental importance in electronics industry – they are utilized in computer drives, drive modules, diagnostic systems, as well as modern systems.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Drawbacks and weaknesses of neodymium magnets: application proposals

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
• We recommend cover - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
• Possible danger related to microscopic parts of magnets are risky, if swallowed, which becomes key in the context of child health protection. Additionally, small elements of these magnets can complicate diagnosis medical after entering the body.
• Due to expensive raw materials, their price exceeds standard values,

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

The load parameter shown represents the limit force, measured under ideal test conditions, specifically:

• on a plate made of structural steel, effectively closing the magnetic flux
• possessing a massiveness of at least 10 mm to avoid saturation
• with an ideally smooth contact surface
• under conditions of no distance (surface-to-surface)
• under perpendicular force vector (90-degree angle)
• at conditions approx. 20°C

Lifting capacity in practice – influencing factors

It is worth knowing that the application force will differ influenced by the following factors, in order of importance:

• Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of maximum force).
• Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
• Steel grade – ideal substrate is pure iron steel. Hardened steels may generate lower lifting capacity.
• Plate texture – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
• Temperature influence – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the holding force is lower. Additionally, even a small distance {between} the magnet’s surface and the plate decreases the load capacity.