AM lina fi 10 mm - magnetic accessories

Strengths as well as weaknesses of neodymium magnets.

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

• They retain full power for nearly 10 years – the drop is just ~1% (according to analyses),
• Neodymium magnets are characterized by highly resistant to demagnetization caused by external field sources,
• Thanks to the reflective finish, the layer of nickel, gold-plated, or silver-plated gives an elegant appearance,
• The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Considering the possibility of precise forming and customization to individualized solutions, NdFeB magnets can be produced in a variety of shapes and sizes, which makes them more universal,
• Significant place in high-tech industry – they serve a role in data components, brushless drives, precision medical tools, as well as technologically advanced constructions.
• Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Characteristics of disadvantages of neodymium magnets and ways of using them

• At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power 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 advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in creating threads and complex shapes in magnets, we recommend using cover - magnetic mechanism.
• Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small elements of these devices can be problematic in diagnostics medical when they are in the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum holding power of the magnet – what it depends on?

The lifting capacity listed is a measurement result conducted under the following configuration:

• on a base made of structural steel, optimally conducting the magnetic field
• possessing a thickness of at least 10 mm to avoid saturation
• characterized by even structure
• without the slightest air gap between the magnet and steel
• during pulling in a direction perpendicular to the plane
• at conditions approx. 20°C

Key elements affecting lifting force

In practice, the real power is determined by many variables, ranked from crucial:

• Gap between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
• Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Steel thickness – insufficiently thick plate does not accept the full field, causing part of the flux to be wasted to the other side.
• Metal type – different alloys attracts identically. High carbon content weaken the attraction effect.
• Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
• Thermal environment – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity was assessed by applying 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 lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate reduces the holding force.