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

Strengths as well as weaknesses of neodymium magnets.

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

• They have constant strength, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
• Neodymium magnets are characterized by exceptionally resistant to demagnetization caused by external magnetic fields,
• Thanks to the shiny finish, the plating of nickel, gold-plated, or silver gives an modern appearance,
• Magnets have huge magnetic induction on the outer layer,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Possibility of custom creating and optimizing to defined needs,
• Huge importance in high-tech industry – they are used in HDD drives, electromotive mechanisms, diagnostic systems, as well as industrial machines.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages of NdFeB magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases 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 power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
• Due to limitations in creating threads and complex shapes in magnets, we propose using casing - magnetic holder.
• Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these products can complicate diagnosis medical when they are in the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Maximum lifting capacity of the magnet – what it depends on?

The specified lifting capacity refers to the limit force, measured under laboratory conditions, specifically:

• on a base made of structural steel, perfectly concentrating the magnetic field
• possessing a thickness of at least 10 mm to avoid saturation
• characterized by lack of roughness
• under conditions of gap-free contact (surface-to-surface)
• for force acting at a right angle (in the magnet axis)
• at room temperature

Magnet lifting force in use – key factors

Please note that the application force will differ subject to the following factors, in order of importance:

• Air gap (between the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, rust or debris).
• Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
• Steel thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be lost into the air.
• Steel grade – ideal substrate is pure iron steel. Hardened steels may attract less.
• Base smoothness – the more even the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
• Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity was assessed with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a small distance {between} the magnet and the plate reduces the holding force.