MPL 40x15x5 / N38 - lamellar magnet

Pros as well as cons of neodymium magnets.

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

• They do not lose strength, even during around ten years – the reduction in strength is only ~1% (according to tests),
• They do not lose their magnetic properties even under close interference source,
• Thanks to the elegant finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an visually attractive appearance,
• They show high magnetic induction at the operating surface, which improves attraction properties,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Possibility of individual shaping as well as adapting to precise requirements,
• Fundamental importance in modern industrial fields – they are utilized in data components, electric drive systems, precision medical tools, and technologically advanced constructions.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons of neodymium magnets and ways of using them

• Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
• Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
• We suggest cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex shapes.
• Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
• With budget limitations the cost of neodymium magnets is economically unviable,

Maximum lifting capacity of the magnet – what affects it?

The declared magnet strength refers to the maximum value, measured under optimal environment, meaning:

• on a block made of structural steel, effectively closing the magnetic flux
• with a cross-section minimum 10 mm
• with an ideally smooth contact surface
• under conditions of gap-free contact (surface-to-surface)
• under axial application of breakaway force (90-degree angle)
• in neutral thermal conditions

Determinants of practical lifting force of a magnet

Please note that the magnet holding will differ influenced by the following factors, in order of importance:

• Distance – existence of any layer (paint, tape, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
• Material composition – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
• Base smoothness – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
• Temperature – temperature increase results in weakening of force. Check the thermal limit for a given model.

* Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.