UMP 97x40 [M8+M10] GW F300 kg / N38 - search holder

Pros as well as cons of neodymium magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• They retain full power for nearly 10 years – the loss is just ~1% (based on simulations),
• They retain their magnetic properties even under strong external field,
• In other words, due to the smooth finish of gold, the element looks attractive,
• Neodymium magnets deliver maximum magnetic induction on a contact point, which allows for strong attraction,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
• Possibility of detailed creating as well as optimizing to defined conditions,
• Fundamental importance in future technologies – they find application in data components, electric drive systems, precision medical tools, also modern systems.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its 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 and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding 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 immune to moisture, in case of application outdoors
• We recommend casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex shapes.
• Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the context of child health protection. It is also worth noting that small components of these devices can complicate diagnosis medical after entering the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum lifting force for a neodymium magnet – what affects it?

The lifting capacity listed is a theoretical maximum value performed under standard conditions:

• using a base made of high-permeability steel, functioning as a ideal flux conductor
• whose transverse dimension is min. 10 mm
• characterized by lack of roughness
• with zero gap (no paint)
• during pulling in a direction perpendicular to the mounting surface
• at standard ambient temperature

Practical lifting capacity: influencing factors

Effective lifting capacity is affected by specific conditions, including (from most important):

• Distance – existence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
• Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
• Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
• Steel grade – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
• Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
• Thermal factor – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet’s surface and the plate decreases the holding force.