MW 10x10 / N38 - cylindrical magnet

Pros and cons of neodymium magnets.

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

• Their power is durable, and after approximately ten years it drops only by ~1% (theoretically),
• They do not lose their magnetic properties even under external field action,
• In other words, due to the shiny layer of gold, the element looks attractive,
• Magnetic induction on the working part of the magnet remains maximum,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures approaching 230°C and above...
• Thanks to versatility in designing and the capacity to adapt to specific needs,
• Wide application in high-tech industry – they are commonly used in mass storage devices, electric motors, diagnostic systems, as well as other advanced devices.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

What to avoid - cons of neodymium magnets: application proposals

• 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 increases its resistance to damage
• Neodymium magnets lose 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
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
• Due to limitations in producing threads and complicated shapes in magnets, we propose using casing - magnetic holder.
• Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, small elements of these products are able to be problematic in diagnostics medical after entering the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Magnetic strength at its maximum – what affects it?

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

• with the use of a yoke made of special test steel, ensuring full magnetic saturation
• possessing a thickness of minimum 10 mm to ensure full flux closure
• with a surface cleaned and smooth
• without any clearance between the magnet and steel
• under perpendicular application of breakaway force (90-degree angle)
• in stable room temperature

Magnet lifting force in use – key factors

In real-world applications, the actual lifting capacity results from many variables, presented from crucial:

• Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
• Load vector – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
• Material composition – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
• Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

* Lifting capacity was determined using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet’s surface and the plate lowers the lifting capacity.