MW 10x10 / N38 - cylindrical magnet

Pros and cons of neodymium magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They retain attractive force for around ten years – the loss is just ~1% (according to analyses),
• They are extremely resistant to demagnetization induced by presence of other magnetic fields,
• The use of an refined layer of noble metals (nickel, gold, silver) causes the element to look better,
• Neodymium magnets generate maximum magnetic induction on a small area, which ensures high operational effectiveness,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
• Thanks to versatility in forming and the capacity to modify to complex applications,
• Key role in electronics industry – they are used in data components, electric motors, precision medical tools, as well as technologically advanced constructions.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Limited ability of making nuts in the magnet and complicated shapes - preferred is a housing - mounting mechanism.
• Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these products can disrupt the diagnostic process medical after entering the body.
• With budget limitations the cost of neodymium magnets can be a barrier,

Breakaway strength of the magnet in ideal conditions – what it depends on?

The lifting capacity listed is a theoretical maximum value executed under the following configuration:

• with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
• whose thickness is min. 10 mm
• with an ground contact surface
• under conditions of gap-free contact (surface-to-surface)
• under perpendicular force direction (90-degree angle)
• in stable room temperature

What influences lifting capacity in practice

During everyday use, the actual holding force is determined by many variables, presented from most significant:

• Air gap (betwixt the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, rust or debris).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Steel thickness – too thin sheet causes magnetic saturation, causing part of the power to be wasted to the other side.
• Steel type – low-carbon steel gives the best results. Alloy steels decrease magnetic properties and holding force.
• Surface quality – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
• Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet and the plate reduces the holding force.