SMZR 25x200 / N52 - magnetic separator with handle

Strengths as well as weaknesses of neodymium magnets.

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

• They retain full power for nearly 10 years – the loss is just ~1% (in theory),
• They have excellent resistance to magnetism drop due to opposing magnetic fields,
• A magnet with a shiny gold surface looks better,
• Neodymium magnets ensure maximum magnetic induction on a their surface, which ensures high operational effectiveness,
• Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
• Possibility of precise modeling as well as optimizing to concrete needs,
• Universal use in future technologies – they serve a role in HDD drives, motor assemblies, diagnostic systems, and multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in small systems

Cons of neodymium magnets: tips and applications.

• At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's 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 and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Limited possibility of creating threads in the magnet and complicated shapes - recommended is cover - magnet mounting.
• Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these devices can be problematic in diagnostics medical in case of swallowing.
• With large orders the cost of neodymium magnets is economically unviable,

Detachment force of the magnet in optimal conditions – what it depends on?

Holding force of 0 kg is a theoretical maximum value conducted under the following configuration:

• using a base made of high-permeability steel, serving as a magnetic yoke
• with a cross-section no less than 10 mm
• with a plane cleaned and smooth
• with total lack of distance (without paint)
• during pulling in a direction vertical to the plane
• at conditions approx. 20°C

Magnet lifting force in use – key factors

Holding efficiency is affected by working environment parameters, such as (from priority):

• Gap (between the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
• Direction of force – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
• Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
• Steel grade – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
• Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
• Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. Additionally, even a minimal clearance {between} the magnet’s surface and the plate lowers the holding force.