SM 32x375 [2xM8] / N52 - magnetic separator

Advantages and disadvantages of NdFeB magnets.

Besides their immense magnetic power, neodymium magnets offer the following advantages:

• Their strength is durable, and after approximately 10 years it drops only by ~1% (theoretically),
• They possess excellent resistance to magnetic field loss as a result of opposing magnetic fields,
• In other words, due to the metallic finish of gold, the element gains a professional look,
• Magnets have extremely high magnetic induction on the outer side,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to modularity in designing and the capacity to adapt to client solutions,
• Significant place in innovative solutions – they are used in mass storage devices, electromotive mechanisms, medical devices, as well as multitasking production systems.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
• Neodymium magnets lose their strength 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 durability even at temperatures up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
• Limited possibility of producing threads in the magnet and complicated shapes - preferred is casing - mounting mechanism.
• Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these products can disrupt the diagnostic process medical after entering the body.
• Due to neodymium price, their price is relatively high,

Magnetic strength at its maximum – what affects it?

Holding force of 0 kg is a result of laboratory testing performed under specific, ideal conditions:

• using a plate made of low-carbon steel, acting as a magnetic yoke
• possessing a massiveness of minimum 10 mm to ensure full flux closure
• with an ideally smooth contact surface
• under conditions of no distance (metal-to-metal)
• under perpendicular force vector (90-degree angle)
• at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

In real-world applications, the actual lifting capacity depends on several key aspects, listed from the most important:

• Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum 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 attracts identically. High carbon content worsen the interaction with the magnet.
• Smoothness – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
• Temperature – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

* Lifting capacity was determined with the use of a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.