UMP 75x25 [M10x3] GW F200 PLATINIUM / N52 - search holder

Pros and cons of rare earth magnets.

Apart from their strong holding force, neodymium magnets have these key benefits:

• They have unchanged lifting capacity, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
• Magnets effectively resist against demagnetization caused by foreign field sources,
• By applying a lustrous coating of nickel, the element presents an professional look,
• Neodymium magnets create maximum magnetic induction on a contact point, which ensures high operational effectiveness,
• Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
• Considering the option of flexible shaping and adaptation to individualized solutions, magnetic components can be modeled in a wide range of shapes and sizes, which expands the range of possible applications,
• Fundamental importance in electronics industry – they find application in magnetic memories, motor assemblies, precision medical tools, as well as technologically advanced constructions.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
• When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
• Limited possibility of making nuts in the magnet and complex shapes - recommended is a housing - mounting mechanism.
• Possible danger resulting from small fragments of magnets are risky, if swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these devices are able to complicate diagnosis medical after entering the body.
• Due to expensive raw materials, their price is relatively high,

Maximum lifting force for a neodymium magnet – what it depends on?

Magnet power is the result of a measurement for the most favorable conditions, including:

• using a plate made of high-permeability steel, acting as a ideal flux conductor
• whose transverse dimension is min. 10 mm
• with a surface perfectly flat
• without the slightest air gap between the magnet and steel
• for force acting at a right angle (pull-off, not shear)
• at temperature room level

Magnet lifting force in use – key factors

It is worth knowing that the magnet holding may be lower influenced by elements below, starting with the most relevant:

• Distance – the presence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Angle of force application – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly many times smaller (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 generating force.
• Plate material – low-carbon steel attracts best. Higher carbon content reduce magnetic permeability and lifting capacity.
• Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
• Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance {between} the magnet and the plate reduces the holding force.