MPL 40x10x4 / N38 - lamellar magnet

Advantages and disadvantages of NdFeB magnets.

Apart from their superior magnetic energy, neodymium magnets have these key benefits:

• They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
• They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
• Thanks to the glossy finish, the plating of nickel, gold-plated, or silver gives an modern appearance,
• The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
• Thanks to versatility in designing and the capacity to adapt to specific needs,
• Key role in high-tech industry – they serve a role in magnetic memories, electric motors, diagnostic systems, as well as other advanced devices.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Drawbacks and weaknesses of neodymium magnets and ways of using them

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
• When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• We suggest cover - magnetic holder, due to difficulties in producing nuts inside the magnet and complicated forms.
• Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these products can disrupt the diagnostic process medical in case of swallowing.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Maximum lifting capacity of the magnet – what contributes to it?

The lifting capacity listed is a result of laboratory testing performed under specific, ideal conditions:

• on a base made of mild steel, effectively closing the magnetic field
• possessing a thickness of min. 10 mm to ensure full flux closure
• with a plane cleaned and smooth
• with direct contact (no impurities)
• under axial force vector (90-degree angle)
• in temp. approx. 20°C

Magnet lifting force in use – key factors

Bear in mind that the working load may be lower depending on the following factors, in order of importance:

• Distance (betwixt the magnet and the metal), since even a very small distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
• Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
• Plate thickness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be wasted into the air.
• Material composition – different alloys attracts identically. Alloy additives weaken the attraction effect.
• Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
• Temperature – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

* Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. Additionally, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.