MPL 50x20x5 / N38 - lamellar magnet

Pros and cons of NdFeB magnets.

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

• They have unchanged lifting capacity, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
• They maintain their magnetic properties even under external field action,
• A magnet with a metallic nickel surface has an effective appearance,
• Magnets possess huge magnetic induction on the active area,
• 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...
• Due to the potential of flexible forming and customization to specialized needs, neodymium magnets can be produced in a variety of forms and dimensions, which increases their versatility,
• Universal use in high-tech industry – they are utilized in computer drives, electric drive systems, diagnostic systems, also multitasking production systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in creating nuts and complicated shapes in magnets, we propose using casing - magnetic mount.
• Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these products are able to be problematic in diagnostics medical in case of swallowing.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Best holding force of the magnet in ideal parameters – what it depends on?

Holding force of 12.49 kg is a theoretical maximum value performed under standard conditions:

• on a base made of structural steel, perfectly concentrating the magnetic field
• with a cross-section no less than 10 mm
• with a surface perfectly flat
• with zero gap (without paint)
• during detachment in a direction vertical to the plane
• at conditions approx. 20°C

Key elements affecting lifting force

Effective lifting capacity is influenced by specific conditions, such as (from priority):

• Space between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
• Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
• Steel type – low-carbon steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
• Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
• Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a slight gap {between} the magnet and the plate decreases the lifting capacity.