AM ucho [M12] - magnetic accessories

Pros and cons of rare earth magnets.

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

• They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
• They are noted for resistance to demagnetization induced by external disturbances,
• By covering with a decorative layer of gold, the element gains an elegant look,
• The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
• Thanks to the option of flexible forming and customization to individualized needs, neodymium magnets can be manufactured in a wide range of shapes and sizes, which amplifies use scope,
• Fundamental importance in high-tech industry – they are utilized in hard drives, electromotive mechanisms, diagnostic systems, as well as multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in miniature devices

Cons of neodymium magnets: tips and applications.

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only protects them against impacts but also increases their durability
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• We recommend casing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex forms.
• Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these magnets can complicate diagnosis medical when they are in the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

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

The force parameter is a theoretical maximum value performed under the following configuration:

• with the contact of a yoke made of low-carbon steel, ensuring full magnetic saturation
• possessing a massiveness of minimum 10 mm to avoid saturation
• with an polished contact surface
• under conditions of gap-free contact (metal-to-metal)
• under axial application of breakaway force (90-degree angle)
• in temp. approx. 20°C

What influences lifting capacity in practice

Real force is affected by specific conditions, such as (from most important):

• Distance – existence of any layer (rust, tape, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
• Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of nominal force).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
• Surface condition – ground elements ensure maximum contact, which increases force. Rough surfaces weaken the grip.
• Thermal factor – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, however under parallel forces the holding force is lower. Additionally, even a small distance {between} the magnet’s surface and the plate lowers the holding force.