MW 29x10 / N38 - cylindrical magnet

Pros as well as cons of NdFeB magnets.

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

• Their strength is maintained, and after approximately ten years it decreases only by ~1% (theoretically),
• Magnets perfectly defend themselves against demagnetization caused by external fields,
• The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
• They feature high magnetic induction at the operating surface, which increases their power,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
• Possibility of exact shaping as well as adapting to defined applications,
• Universal use in advanced technology sectors – they find application in HDD drives, electric drive systems, advanced medical instruments, also industrial machines.
• 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:

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• We recommend a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex shapes.
• Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these magnets can complicate diagnosis medical in case of swallowing.
• With mass production the cost of neodymium magnets is a challenge,

Optimal lifting capacity of a neodymium magnet – what affects it?

The force parameter is a measurement result conducted under standard conditions:

• on a base made of mild steel, effectively closing the magnetic flux
• whose transverse dimension reaches at least 10 mm
• characterized by even structure
• without any air gap between the magnet and steel
• under perpendicular application of breakaway force (90-degree angle)
• at room temperature

Impact of factors on magnetic holding capacity in practice

Please note that the application force may be lower depending on the following factors, in order of importance:

• Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
• Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
• Metal type – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
• Base smoothness – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
• Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a small distance {between} the magnet’s surface and the plate lowers the holding force.