UMP 75x25 [M10x3] GW F200 GOLD Lina / N42 - search holder

Strengths and weaknesses of neodymium magnets.

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

• Their power is durable, and after around 10 years it decreases only by ~1% (according to research),
• They maintain their magnetic properties even under close interference source,
• The use of an refined layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
• Neodymium magnets achieve maximum magnetic induction on a their surface, which ensures high operational effectiveness,
• 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...
• Thanks to modularity in constructing and the capacity to adapt to unusual requirements,
• Universal use in electronics industry – they are used in computer drives, brushless drives, medical equipment, also complex engineering applications.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons of neodymium magnets and proposals for their use:

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
• When exposed to high temperature, neodymium magnets suffer 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
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
• Limited possibility of creating threads in the magnet and complex forms - preferred is casing - mounting mechanism.
• Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
• Due to complex production process, their price is higher than average,

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

The specified lifting capacity refers to the limit force, measured under optimal environment, namely:

• with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
• possessing a massiveness of at least 10 mm to ensure full flux closure
• characterized by lack of roughness
• under conditions of no distance (metal-to-metal)
• for force applied at a right angle (pull-off, not shear)
• at ambient temperature room level

Lifting capacity in practice – influencing factors

It is worth knowing that the working load may be lower depending on elements below, starting with the most relevant:

• Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
• Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
• Metal type – different alloys attracts identically. High carbon content weaken the attraction effect.
• Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
• Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the holding force is lower. Additionally, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.