SM 32x425 [2xM8] / N52 - magnetic separator

Strengths and weaknesses of NdFeB magnets.

Besides their remarkable field intensity, neodymium magnets offer the following advantages:

• They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
• They feature excellent resistance to magnetism drop as a result of external magnetic sources,
• By covering with a smooth coating of nickel, the element presents an aesthetic look,
• The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
• Thanks to freedom in designing and the capacity to customize to individual projects,
• Significant place in innovative solutions – they are commonly used in magnetic memories, electromotive mechanisms, advanced medical instruments, as well as other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions

Characteristics of disadvantages of neodymium magnets: tips and applications.

• At very strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets start to rust. For applications 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 producing threads in the magnet and complex forms - preferred is a housing - mounting mechanism.
• Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these magnets can complicate diagnosis medical in case of swallowing.
• Due to complex production process, their price exceeds standard values,

Optimal lifting capacity of a neodymium magnet – what it depends on?

Breakaway force was defined for ideal contact conditions, including:

• on a base made of mild steel, perfectly concentrating the magnetic flux
• whose transverse dimension reaches at least 10 mm
• with a surface perfectly flat
• without the slightest air gap between the magnet and steel
• under perpendicular application of breakaway force (90-degree angle)
• at room temperature

Lifting capacity in real conditions – factors

Effective lifting capacity is influenced by working environment parameters, mainly (from most important):

• Distance (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
• Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
• Plate thickness – insufficiently thick steel does not accept the full field, causing part of the power to be lost to the other side.
• Material type – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
• Smoothness – full contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
• Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

* Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate decreases the lifting capacity.