SM 32x250 [2xM8] / N52 - magnetic separator

Pros as well as cons of rare earth magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
• They maintain their magnetic properties even under strong external field,
• By using a lustrous layer of gold, the element gains an elegant look,
• Neodymium magnets ensure maximum magnetic induction on a small surface, which allows for strong attraction,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
• In view of the option of accurate forming and adaptation to individualized solutions, neodymium magnets can be modeled in a broad palette of shapes and sizes, which makes them more universal,
• Huge importance in innovative solutions – they are used in magnetic memories, drive modules, medical devices, as well as industrial machines.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Cons of neodymium magnets: weaknesses and usage proposals

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
• When exposed to high temperature, neodymium magnets experience a drop in strength. 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
• Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in creating threads and complex shapes in magnets, we recommend using a housing - magnetic mechanism.
• Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
• With large orders the cost of neodymium magnets can be a barrier,

Breakaway strength of the magnet in ideal conditions – what affects it?

The specified lifting capacity represents the maximum value, recorded under laboratory conditions, meaning:

• using a plate made of low-carbon steel, acting as a ideal flux conductor
• whose transverse dimension equals approx. 10 mm
• characterized by even structure
• under conditions of no distance (metal-to-metal)
• under perpendicular force vector (90-degree angle)
• at ambient temperature room level

Key elements affecting lifting force

During everyday use, the real power results from a number of factors, listed from crucial:

• Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
• Load vector – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
• Material composition – not every steel attracts identically. High carbon content weaken the attraction effect.
• Surface finish – ideal contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
• Thermal factor – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

* Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, however under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a slight gap {between} the magnet and the plate reduces the load capacity.