AM Magnetyczny zbieracz / N38 - magnetic accessories

Pros as well as cons of neodymium magnets.

Besides their exceptional strength, neodymium magnets offer the following advantages:

• Their strength is durable, and after approximately ten years it decreases only by ~1% (theoretically),
• They are extremely resistant to demagnetization induced by external magnetic fields,
• By covering with a decorative coating of gold, the element acquires an aesthetic look,
• Magnets possess very high magnetic induction on the working surface,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Due to the potential of precise molding and adaptation to individualized requirements, neodymium magnets can be produced in a broad palette of shapes and sizes, which makes them more universal,
• Wide application in high-tech industry – they serve a role in hard drives, electric drive systems, precision medical tools, and multitasking production systems.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

• They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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 very resistant to heat
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable 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 shapes.
• Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. Additionally, small components of these products are able to complicate diagnosis medical in case of swallowing.
• With large orders the cost of neodymium magnets is economically unviable,

Maximum lifting force for a neodymium magnet – what contributes to it?

Breakaway force was defined for the most favorable conditions, assuming:

• with the application of a sheet made of special test steel, guaranteeing maximum field concentration
• with a thickness of at least 10 mm
• with an ideally smooth touching surface
• with zero gap (no impurities)
• during detachment in a direction perpendicular to the plane
• at conditions approx. 20°C

Lifting capacity in practice – influencing factors

In practice, the real power is determined by several key aspects, listed from crucial:

• Clearance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
• Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
• Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
• Steel grade – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
• Surface quality – the more even the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
• Thermal environment – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the holding force is lower. Moreover, even a minimal clearance {between} the magnet and the plate lowers the load capacity.