UMP 75x24 [M8+M10] GW F 200 kg - search holder

Advantages and disadvantages of NdFeB magnets.

Apart from their strong power, neodymium magnets have these key benefits:

• They have stable power, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
• Neodymium magnets are characterized by remarkably resistant to demagnetization caused by external interference,
• Thanks to the glossy finish, the layer of nickel, gold-plated, or silver-plated gives an aesthetic appearance,
• The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
• Due to the potential of precise forming and customization to individualized needs, NdFeB magnets can be created in a wide range of geometric configurations, which makes them more universal,
• Key role in future technologies – they serve a role in data components, electromotive mechanisms, diagnostic systems, as well as complex engineering applications.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

What to avoid - cons of neodymium magnets and ways of using them

• To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
• Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• Limited ability of producing nuts in the magnet and complex forms - recommended is a housing - magnet mounting.
• Potential hazard related to microscopic parts of magnets are risky, if swallowed, which gains importance in the context of child safety. Additionally, small elements of these products are able to complicate diagnosis medical when they are in the body.
• Due to expensive raw materials, their price exceeds standard values,

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

The declared magnet strength refers to the peak performance, recorded under ideal test conditions, namely:

• using a plate made of low-carbon steel, acting as a circuit closing element
• possessing a massiveness of at least 10 mm to ensure full flux closure
• characterized by even structure
• with zero gap (without coatings)
• under perpendicular application of breakaway force (90-degree angle)
• at room temperature

Impact of factors on magnetic holding capacity in practice

During everyday use, the actual holding force results from many variables, ranked from the most important:

• Clearance – existence of any layer (rust, dirt, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
• Plate thickness – too thin steel does not close the flux, causing part of the flux to be escaped into the air.
• Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
• Surface finish – full contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
• Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the load capacity.