SM 32x200 [2xM8] / N52 - magnetic separator

Pros as well as cons of NdFeB magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

• Their magnetic field is maintained, and after around 10 years it decreases only by ~1% (according to research),
• Magnets very well resist against demagnetization caused by foreign field sources,
• The use of an refined finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• Magnetic induction on the working layer of the magnet turns out to be exceptional,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Possibility of precise forming as well as modifying to complex conditions,
• Key role in electronics industry – they are commonly used in data components, motor assemblies, precision medical tools, and industrial machines.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
• When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in producing nuts and complex shapes in magnets, we recommend using casing - magnetic mechanism.
• Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child health protection. Furthermore, small components of these devices can disrupt the diagnostic process medical when they are in the body.
• With large orders the cost of neodymium magnets is a challenge,

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Holding force of 0 kg is a theoretical maximum value performed under the following configuration:

• using a base made of mild steel, functioning as a ideal flux conductor
• whose thickness equals approx. 10 mm
• with an polished contact surface
• under conditions of ideal adhesion (metal-to-metal)
• under vertical application of breakaway force (90-degree angle)
• at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

During everyday use, the actual lifting capacity depends on many variables, ranked from most significant:

• Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
• Plate material – low-carbon steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
• Smoothness – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
• Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance {between} the magnet and the plate decreases the holding force.