UMGB 107x40 [M8+M10] GW F400 +Lina GOBLIN / N38 - goblin magnetic holder

Strengths and weaknesses of rare earth magnets.

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

• They retain full power for almost 10 years – the drop is just ~1% (based on simulations),
• Magnets perfectly resist against demagnetization caused by foreign field sources,
• In other words, due to the smooth finish of nickel, the element looks attractive,
• Neodymium magnets deliver maximum magnetic induction on a small surface, which allows for strong attraction,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
• Possibility of exact creating and optimizing to atypical conditions,
• Versatile presence in advanced technology sectors – they are commonly used in computer drives, drive modules, diagnostic systems, also complex engineering applications.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals

• At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in creating threads and complex shapes in magnets, we recommend using cover - magnetic mount.
• Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Additionally, small elements of these devices are able to complicate diagnosis medical in case of swallowing.
• Due to expensive raw materials, their price exceeds standard values,

Maximum holding power of the magnet – what affects it?

The specified lifting capacity represents the maximum value, recorded under optimal environment, namely:

• using a plate made of mild steel, serving as a ideal flux conductor
• with a thickness of at least 10 mm
• with an ground contact surface
• without any air gap between the magnet and steel
• during detachment in a direction perpendicular to the mounting surface
• at temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Holding efficiency is influenced by working environment parameters, including (from priority):

• Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Metal 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 reacts the same. Alloy additives weaken the interaction with the magnet.
• Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
• Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet’s surface and the plate reduces the holding force.