UMP 67x28 [M8+M10] GW F120 Lina / N38 - search holder

Advantages and disadvantages of NdFeB magnets.

Besides their remarkable field intensity, neodymium magnets offer the following advantages:

• They do not lose strength, even during approximately ten years – the drop in lifting capacity is only ~1% (theoretically),
• Neodymium magnets are characterized by remarkably resistant to magnetic field loss caused by external interference,
• By using a smooth coating of gold, the element presents an aesthetic look,
• They feature high magnetic induction at the operating surface, which increases their power,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
• Due to the possibility of free forming and adaptation to individualized projects, neodymium magnets can be produced in a broad palette of forms and dimensions, which expands the range of possible applications,
• Significant place in future technologies – they are utilized in hard drives, electromotive mechanisms, medical equipment, and multitasking production systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Drawbacks and weaknesses of neodymium magnets: tips and applications.

• At very strong impacts they can break, therefore we recommend 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 force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Limited possibility of producing threads in the magnet and complex forms - recommended is cover - magnetic holder.
• Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can be problematic in diagnostics medical in case of swallowing.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum holding power of the magnet – what it depends on?

The lifting capacity listed is a result of laboratory testing executed under standard conditions:

• with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
• with a thickness no less than 10 mm
• characterized by smoothness
• with direct contact (no paint)
• for force acting at a right angle (in the magnet axis)
• at temperature room level

Lifting capacity in practice – influencing factors

Real force is influenced by working environment parameters, mainly (from priority):

• Gap (betwixt the magnet and the plate), since even a very small distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
• Direction of force – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
• Material composition – different alloys attracts identically. High carbon content weaken the attraction effect.
• Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
• Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap {between} the magnet’s surface and the plate decreases the holding force.