FM Ruszt magnetyczny do leja fi 200 jednopoziomowy / N52 - magnetic filter

Pros as well as cons of neodymium magnets.

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

• They retain full power for nearly 10 years – the loss is just ~1% (based on simulations),
• Neodymium magnets remain highly resistant to loss of magnetic properties caused by external field sources,
• A magnet with a shiny gold surface has better aesthetics,
• The surface of neodymium magnets generates a concentrated 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 flexibility in shaping and the ability to customize to unusual requirements,
• Significant place in high-tech industry – they find application in hard drives, electric motors, precision medical tools, as well as technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in miniature devices

Cons of neodymium magnets: application proposals

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise 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 those in rubber or plastics, which secure oxidation and corrosion.
• We recommend a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated shapes.
• Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small elements of these products are able to complicate diagnosis medical in case of swallowing.
• With mass production the cost of neodymium magnets is a challenge,

Maximum lifting capacity of the magnet – what it depends on?

The load parameter shown represents the peak performance, measured under laboratory conditions, specifically:

• using a sheet made of high-permeability steel, acting as a circuit closing element
• whose transverse dimension is min. 10 mm
• with an ideally smooth contact surface
• under conditions of ideal adhesion (surface-to-surface)
• for force applied at a right angle (pull-off, not shear)
• in stable room temperature

Impact of factors on magnetic holding capacity in practice

In practice, the actual holding force is determined by many variables, presented from the most important:

• Air gap (betwixt the magnet and the plate), because even a very small clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
• Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
• Chemical composition of the base – mild steel attracts best. Alloy admixtures lower magnetic permeability and holding force.
• Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
• Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity was determined by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance {between} the magnet and the plate lowers the load capacity.