AM ucho [M12] - magnetic accessories

Advantages and disadvantages of rare earth magnets.

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

• Their strength remains stable, and after around ten years it decreases only by ~1% (according to research),
• They have excellent resistance to magnetism drop as a result of opposing magnetic fields,
• Thanks to the glossy finish, the coating of Ni-Cu-Ni, gold-plated, or silver gives an modern appearance,
• Neodymium magnets ensure maximum magnetic induction on a contact point, which allows for strong attraction,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Considering the option of precise forming and adaptation to specialized solutions, neodymium magnets can be produced in a broad palette of shapes and sizes, which amplifies use scope,
• Key role in modern technologies – they are utilized in hard drives, motor assemblies, precision medical tools, also complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
• Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in realizing threads and complicated forms in magnets, we propose using cover - magnetic mount.
• Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Furthermore, small elements of these products are able to be problematic in diagnostics medical after entering the body.
• Due to neodymium price, their price is relatively high,

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

Information about lifting capacity was determined for optimal configuration, including:

• with the use of a yoke made of special test steel, guaranteeing full magnetic saturation
• possessing a massiveness of minimum 10 mm to avoid saturation
• with an ground touching surface
• under conditions of ideal adhesion (surface-to-surface)
• for force applied at a right angle (in the magnet axis)
• at standard ambient temperature

Lifting capacity in practice – influencing factors

During everyday use, the real power depends on many variables, listed from crucial:

• Clearance – existence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
• Direction of force – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
• Steel type – mild steel attracts best. Alloy admixtures lower magnetic properties and lifting capacity.
• Surface quality – the more even the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
• Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity was measured by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the load capacity is reduced by as much as 5 times. In addition, even a small distance {between} the magnet and the plate lowers the holding force.