UMP 94x28 [3xM10] GW F300 GOLD / N38 - search holder

Pros and cons of neodymium magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• Their power is maintained, and after approximately 10 years it drops only by ~1% (theoretically),
• Magnets perfectly resist against demagnetization caused by ambient magnetic noise,
• Thanks to the shiny finish, the layer of Ni-Cu-Ni, gold, or silver gives an professional appearance,
• Neodymium magnets generate maximum magnetic induction on a small area, which ensures high operational effectiveness,
• 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...
• In view of the possibility of precise shaping and customization to specialized needs, magnetic components can be modeled in a wide range of forms and dimensions, which amplifies use scope,
• Universal use in future technologies – they are used in hard drives, electric motors, advanced medical instruments, and other advanced devices.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Problematic aspects of neodymium magnets and ways of using them

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
• 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
• They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• We recommend cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated shapes.
• Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these devices are able to be problematic in diagnostics medical after entering the body.
• Due to complex production process, their price exceeds standard values,

Maximum magnetic pulling force – what affects it?

The specified lifting capacity represents the peak performance, obtained under laboratory conditions, meaning:

• using a plate made of low-carbon steel, serving as a magnetic yoke
• possessing a massiveness of minimum 10 mm to avoid saturation
• with an ideally smooth touching surface
• without the slightest clearance between the magnet and steel
• for force acting at a right angle (in the magnet axis)
• at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

During everyday use, the actual lifting capacity depends on several key aspects, ranked from most significant:

• Air gap (between the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
• Direction of force – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
• Plate material – mild steel gives the best results. Alloy admixtures reduce magnetic properties and holding force.
• Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
• Temperature – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet and the plate lowers the lifting capacity.