MPL 50x20x5 / N38 - lamellar magnet

Pros and cons of rare earth magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• They do not lose strength, even over around ten years – the decrease in power is only ~1% (theoretically),
• Magnets very well defend themselves against loss of magnetization caused by ambient magnetic noise,
• In other words, due to the aesthetic layer of gold, the element is aesthetically pleasing,
• The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures approaching 230°C and above...
• Thanks to flexibility in forming and the ability to customize to specific needs,
• Universal use in advanced technology sectors – they are used in HDD drives, drive modules, medical equipment, also technologically advanced constructions.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

• At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
• When exposed to high temperature, neodymium magnets experience a drop in force. 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
• They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Due to limitations in realizing nuts and complex shapes in magnets, we propose using cover - magnetic holder.
• Health risk related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these magnets can be problematic in diagnostics medical when they are in the body.
• Due to expensive raw materials, their price exceeds standard values,

Maximum holding power of the magnet – what contributes to it?

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

• with the contact of a sheet made of low-carbon steel, ensuring maximum field concentration
• possessing a massiveness of at least 10 mm to avoid saturation
• with a surface cleaned and smooth
• with zero gap (no paint)
• under perpendicular force vector (90-degree angle)
• at room temperature

Determinants of lifting force in real conditions

In real-world applications, the real power is determined by several key aspects, presented from crucial:

• Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
• Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
• Base massiveness – too thin sheet does not accept the full field, causing part of the power to be wasted into the air.
• Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
• Surface finish – full contact is possible only on polished steel. Rough texture create air cushions, reducing force.
• Thermal factor – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet’s surface and the plate decreases the holding force.