SM 32x275 [2xM8] / N42 - magnetic separator

Strengths as well as weaknesses of neodymium magnets.

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:

• They retain full power for almost ten years – the drop is just ~1% (in theory),
• Magnets very well resist against demagnetization caused by external fields,
• By applying a decorative layer of silver, the element gains an aesthetic look,
• The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Possibility of detailed forming and adapting to atypical needs,
• Universal use in innovative solutions – they are commonly used in hard drives, motor assemblies, medical equipment, as well as other advanced devices.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons of neodymium magnets: tips and applications.

• At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
• Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Limited ability of making nuts in the magnet and complex forms - preferred is a housing - magnet mounting.
• Health risk related to microscopic parts of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these products can complicate diagnosis medical in case of swallowing.
• With mass production the cost of neodymium magnets is economically unviable,

Maximum magnetic pulling force – what affects it?

The lifting capacity listed is a measurement result performed under standard conditions:

• using a plate made of high-permeability steel, functioning as a magnetic yoke
• whose thickness equals approx. 10 mm
• with an polished contact surface
• under conditions of no distance (metal-to-metal)
• under perpendicular force direction (90-degree angle)
• at conditions approx. 20°C

Lifting capacity in practice – influencing factors

Bear in mind that the magnet holding may be lower influenced by elements below, in order of importance:

• Air gap (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, corrosion or dirt).
• Angle of force application – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
• Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Material type – ideal substrate is pure iron steel. Cast iron may attract less.
• Surface quality – the more even the plate, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
• Temperature influence – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

* Lifting capacity was determined using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the holding force is lower. Additionally, even a minimal clearance {between} the magnet’s surface and the plate decreases the lifting capacity.