UMGB 75x28 [M10x3] GW F200 GOLD +Lina GOBLIN / N42 - goblin magnetic holder

Advantages as well as disadvantages of rare earth magnets.

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

• They have stable power, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
• They are noted for resistance to demagnetization induced by external disturbances,
• Thanks to the metallic finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
• Magnets have excellent magnetic induction on the outer layer,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures reaching 230°C and above...
• Possibility of exact forming and adjusting to complex requirements,
• Key role in modern industrial fields – they are utilized in mass storage devices, electric drive systems, diagnostic systems, as well as technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems

Characteristics of disadvantages of neodymium magnets: tips and applications.

• They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
• Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• We suggest cover - magnetic holder, due to difficulties in producing threads inside the magnet and complex shapes.
• Potential hazard related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. Additionally, small components of these devices can disrupt the diagnostic process medical in case of swallowing.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting capacity of the magnet – what contributes to it?

The specified lifting capacity concerns the limit force, obtained under laboratory conditions, meaning:

• on a block made of structural steel, effectively closing the magnetic flux
• with a thickness of at least 10 mm
• with a surface cleaned and smooth
• with direct contact (no impurities)
• under perpendicular force vector (90-degree angle)
• at conditions approx. 20°C

Key elements affecting lifting force

It is worth knowing that the application force may be lower subject to elements below, in order of importance:

• Distance (between the magnet and the plate), because even a very small distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
• Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
• Steel thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be escaped to the other side.
• Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
• Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
• Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate decreases the load capacity.