AM lina fi 10 mm - magnetic accessories

Strengths and weaknesses of rare earth magnets.

Besides their tremendous field intensity, neodymium magnets offer the following advantages:

• Their strength is maintained, and after approximately ten years it drops only by ~1% (theoretically),
• Neodymium magnets are distinguished by exceptionally resistant to demagnetization caused by magnetic disturbances,
• A magnet with a smooth silver surface is more attractive,
• The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
• Possibility of precise modeling and optimizing to complex conditions,
• Fundamental importance in innovative solutions – they are utilized in computer drives, electric drive systems, medical equipment, and multitasking production systems.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Characteristics of disadvantages of neodymium magnets: tips and applications.

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
• When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Limited possibility of making threads in the magnet and complex shapes - recommended is a housing - magnetic holder.
• Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
• Due to expensive raw materials, their price exceeds standard values,

Detachment force of the magnet in optimal conditions – what it depends on?

The declared magnet strength represents the peak performance, recorded under laboratory conditions, namely:

• on a base made of mild steel, optimally conducting the magnetic flux
• whose thickness reaches at least 10 mm
• with a plane free of scratches
• with total lack of distance (no coatings)
• during detachment in a direction vertical to the plane
• in neutral thermal conditions

Impact of factors on magnetic holding capacity in practice

Bear in mind that the magnet holding may be lower subject to elements below, starting with the most relevant:

• Distance – the presence of any layer (rust, dirt, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
• Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Plate thickness – too thin sheet causes magnetic saturation, causing part of the power to be wasted into the air.
• Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
• Surface condition – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
• Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the lifting capacity is smaller. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the holding force.