UMGB 67x28 [M8+M10] GW F 120+ Lina GOBLIN / N38 - goblin magnetic holder

Pros as well as cons of neodymium magnets.

Besides their remarkable pulling force, neodymium magnets offer the following advantages:

• They retain attractive force for almost ten years – the drop is just ~1% (according to analyses),
• Magnets very well resist against demagnetization caused by foreign field sources,
• A magnet with a metallic gold surface looks better,
• The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
• 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 exact modeling and modifying to specific needs,
• Universal use in innovative solutions – they are used in data components, electric drive systems, diagnostic systems, also modern systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

What to avoid - cons of neodymium magnets: tips and applications.

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
• When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength 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
• They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Limited possibility of creating nuts in the magnet and complicated forms - recommended is cover - mounting mechanism.
• Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these devices are able to be problematic in diagnostics 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 holding power of the magnet – what contributes to it?

Holding force of 180 kg is a theoretical maximum value executed under standard conditions:

• with the use of a sheet made of special test steel, guaranteeing maximum field concentration
• whose thickness reaches at least 10 mm
• with an ideally smooth contact surface
• with total lack of distance (without impurities)
• under vertical force direction (90-degree angle)
• at temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Real force is influenced by specific conditions, such as (from priority):

• Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
• Load vector – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
• Base massiveness – insufficiently thick sheet does not accept the full field, causing part of the power to be wasted into the air.
• Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
• Surface quality – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
• Temperature influence – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate reduces the holding force.