SM 32x350 [2xM8] / N42 - magnetic separator

Advantages and disadvantages of neodymium magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• Their strength remains stable, and after around ten years it drops only by ~1% (according to research),
• They do not lose their magnetic properties even under close interference source,
• A magnet with a metallic nickel surface has an effective appearance,
• The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to the ability of precise forming and customization to individualized requirements, neodymium magnets can be produced in a wide range of shapes and sizes, which amplifies use scope,
• Fundamental importance in high-tech industry – they serve a role in HDD drives, motor assemblies, advanced medical instruments, also industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in miniature devices

Problematic aspects of neodymium magnets and proposals for their use:

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields 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
• When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
• Due to limitations in creating nuts and complicated forms in magnets, we recommend using a housing - magnetic holder.
• Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
• With large orders the cost of neodymium magnets can be a barrier,

Maximum magnetic pulling force – what affects it?

The specified lifting capacity refers to the peak performance, obtained under laboratory conditions, namely:

• on a plate made of mild steel, perfectly concentrating the magnetic field
• possessing a thickness of min. 10 mm to avoid saturation
• with a surface cleaned and smooth
• without any clearance between the magnet and steel
• under perpendicular force vector (90-degree angle)
• at room temperature

Lifting capacity in real conditions – factors

It is worth knowing that the working load will differ depending on elements below, in order of importance:

• Distance – the presence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
• Material composition – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
• Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
• Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet and the plate reduces the holding force.

Advantages and disadvantages of neodymium magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• Their strength remains stable, and after around ten years it drops only by ~1% (according to research),
• They do not lose their magnetic properties even under close interference source,
• A magnet with a metallic nickel surface has an effective appearance,
• The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to the ability of precise forming and customization to individualized requirements, neodymium magnets can be produced in a wide range of shapes and sizes, which amplifies use scope,
• Fundamental importance in high-tech industry – they serve a role in HDD drives, motor assemblies, advanced medical instruments, also industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in miniature devices

Problematic aspects of neodymium magnets and proposals for their use:

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields 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
• When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
• Due to limitations in creating nuts and complicated forms in magnets, we recommend using a housing - magnetic holder.
• Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
• With large orders the cost of neodymium magnets can be a barrier,

Maximum magnetic pulling force – what affects it?

The specified lifting capacity refers to the peak performance, obtained under laboratory conditions, namely:

• on a plate made of mild steel, perfectly concentrating the magnetic field
• possessing a thickness of min. 10 mm to avoid saturation
• with a surface cleaned and smooth
• without any clearance between the magnet and steel
• under perpendicular force vector (90-degree angle)
• at room temperature

Lifting capacity in real conditions – factors

It is worth knowing that the working load will differ depending on elements below, in order of importance:

• Distance – the presence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
• Material composition – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
• Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
• Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet and the plate reduces the holding force.