MW 38x3.5 / N38 - cylindrical magnet

Pros as well as cons of NdFeB magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They retain full power for nearly 10 years – the loss is just ~1% (based on simulations),
• They have excellent resistance to magnetic field loss as a result of external fields,
• The use of an refined layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• Magnets exhibit extremely high magnetic induction on the outer side,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
• Thanks to flexibility in constructing and the capacity to customize to specific needs,
• Key role in electronics industry – they find application in mass storage devices, brushless drives, medical devices, also industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in miniature devices

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

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also raises their 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, as well as 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 protecting against moisture
• Due to limitations in realizing nuts and complicated forms in magnets, we recommend using casing - magnetic holder.
• Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can complicate diagnosis 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 lifting force for a neodymium magnet – what it depends on?

The specified lifting capacity concerns the peak performance, recorded under laboratory conditions, meaning:

• on a base made of structural steel, effectively closing the magnetic flux
• whose transverse dimension reaches at least 10 mm
• with an ideally smooth contact surface
• with zero gap (no paint)
• during pulling in a direction vertical to the mounting surface
• at conditions approx. 20°C

Magnet lifting force in use – key factors

In practice, the real power is determined by a number of factors, presented from the most important:

• Distance – existence of foreign body (paint, tape, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
• Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of maximum force).
• Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Steel type – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and lifting capacity.
• Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
• Temperature – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, however under shearing force the load capacity is reduced by as much as 75%. In addition, even a slight gap {between} the magnet’s surface and the plate reduces the load capacity.