MPL 5x5x1.5 / N38 - lamellar magnet

Pros as well as cons of rare earth magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They retain full power for nearly ten years – the drop is just ~1% (in theory),
• Neodymium magnets are highly resistant to loss of magnetic properties caused by external field sources,
• A magnet with a metallic gold surface has an effective appearance,
• Magnets possess extremely high magnetic induction on the working surface,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to modularity in forming and the ability to adapt to individual projects,
• Key role in future technologies – they serve a role in data components, electric motors, medical devices, as well as complex engineering applications.
• Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting 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 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
• Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Limited possibility of producing nuts in the magnet and complicated shapes - preferred is cover - magnetic holder.
• Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these products are able to be problematic in diagnostics medical after entering the body.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

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

The force parameter is a theoretical maximum value conducted under specific, ideal conditions:

• with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
• with a thickness of at least 10 mm
• with an ground contact surface
• without any clearance between the magnet and steel
• under perpendicular application of breakaway force (90-degree angle)
• at conditions approx. 20°C

Magnet lifting force in use – key factors

In real-world applications, the real power depends on several key aspects, listed from crucial:

• Clearance – the presence of foreign body (rust, tape, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
• Direction of force – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
• Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Steel type – mild steel attracts best. Alloy admixtures decrease magnetic permeability and lifting capacity.
• Smoothness – full contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
• Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

* Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the holding force is lower. In addition, even a small distance {between} the magnet and the plate lowers the load capacity.