MPL 40x10x4 / N38 - lamellar magnet

Pros and cons of rare earth magnets.

Apart from their superior magnetic energy, neodymium magnets have these key benefits:

• They do not lose power, even after approximately ten years – the reduction in lifting capacity is only ~1% (theoretically),
• Magnets effectively resist against demagnetization caused by external fields,
• By applying a smooth layer of nickel, the element presents an modern look,
• Neodymium magnets create maximum magnetic induction on a small area, which increases force concentration,
• 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...
• Possibility of accurate forming as well as optimizing to individual needs,
• Significant place in electronics industry – they are utilized in data components, electric drive systems, diagnostic systems, also modern systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in compact constructions

Disadvantages of neodymium magnets:

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
• NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 corrode. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in creating nuts and complex forms in magnets, we propose using casing - magnetic holder.
• Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
• With large orders the cost of neodymium magnets can be a barrier,

Maximum magnetic pulling force – what affects it?

Holding force of 6.32 kg is a theoretical maximum value executed under the following configuration:

• using a base made of low-carbon steel, functioning as a magnetic yoke
• possessing a thickness of minimum 10 mm to ensure full flux closure
• characterized by smoothness
• without any clearance between the magnet and steel
• during detachment in a direction perpendicular to the mounting surface
• at conditions approx. 20°C

Lifting capacity in real conditions – factors

Holding efficiency is affected by specific conditions, including (from priority):

• Clearance – the presence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
• Angle of force application – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
• Steel thickness – insufficiently thick plate does not close the flux, causing part of the power to be lost into the air.
• Material composition – not every steel reacts the same. High carbon content worsen the attraction effect.
• Base smoothness – the more even the surface, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
• Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance {between} the magnet’s surface and the plate lowers the lifting capacity.