XT-4 magnetyzery CO i WODY użytkowej - XT-4 magnetizer

Strengths and weaknesses of NdFeB magnets.

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

• Their magnetic field remains stable, and after around 10 years it drops only by ~1% (theoretically),
• They do not lose their magnetic properties even under close interference source,
• Thanks to the shiny finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an professional appearance,
• Magnets possess extremely high magnetic induction on the outer side,
• 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...
• Considering the option of free molding and adaptation to individualized projects, NdFeB magnets can be produced in a variety of shapes and sizes, which expands the range of possible applications,
• Fundamental importance in future technologies – they are commonly used in computer drives, electric motors, advanced medical instruments, and multitasking production systems.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Drawbacks and weaknesses of neodymium magnets and ways of using them

• To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
• When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• Limited possibility of creating threads in the magnet and complex forms - recommended is casing - magnetic holder.
• Possible danger resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Additionally, small components of these magnets can complicate diagnosis medical when they are in the body.
• With budget limitations the cost of neodymium magnets is economically unviable,

Optimal lifting capacity of a neodymium magnet – what affects it?

The load parameter shown concerns the maximum value, measured under laboratory conditions, meaning:

• with the contact of a yoke made of special test steel, ensuring full magnetic saturation
• with a thickness of at least 10 mm
• with an ideally smooth touching surface
• without the slightest insulating layer between the magnet and steel
• under perpendicular application of breakaway force (90-degree angle)
• at temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

In practice, the actual holding force depends on a number of factors, ranked from the most important:

• Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
• Steel thickness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be wasted into the air.
• Material type – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
• Surface finish – full contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
• Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. Moreover, even a minimal clearance {between} the magnet’s surface and the plate decreases the holding force.