BM 380x180x70 [4x M8] - magnetic beam

Advantages as well as disadvantages of neodymium magnets.

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

• They do not lose strength, even after approximately 10 years – the decrease in strength is only ~1% (based on measurements),
• Neodymium magnets remain extremely resistant to magnetic field loss caused by external interference,
• In other words, due to the reflective layer of nickel, the element gains a professional look,
• Magnets possess maximum magnetic induction on the outer side,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
• In view of the possibility of precise molding and customization to unique needs, NdFeB magnets can be modeled in a variety of shapes and sizes, which amplifies use scope,
• Fundamental importance in future technologies – they are used in data components, electric motors, medical equipment, as well as complex engineering applications.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

What to avoid - cons of neodymium magnets: tips and applications.

• At very strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• When exposed to high temperature, neodymium magnets experience 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 advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• Due to limitations in creating nuts and complex shapes in magnets, we recommend using casing - magnetic holder.
• Health risk resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these devices can be problematic in diagnostics medical when they are in the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum magnetic pulling force – what it depends on?

The lifting capacity listed is a result of laboratory testing executed under specific, ideal conditions:

• with the use of a sheet made of special test steel, ensuring full magnetic saturation
• with a thickness of at least 10 mm
• with an polished touching surface
• under conditions of ideal adhesion (surface-to-surface)
• for force acting at a right angle (in the magnet axis)
• at conditions approx. 20°C

Determinants of practical lifting force of a magnet

Holding efficiency impacted by working environment parameters, such as (from priority):

• Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
• Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of nominal force).
• Plate thickness – too thin steel causes magnetic saturation, causing part of the power to be wasted into the air.
• Steel grade – ideal substrate is high-permeability steel. Stainless steels may generate lower lifting capacity.
• Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
• Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

* Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance {between} the magnet and the plate decreases the holding force.