SMZR 25x175 / N52 - magnetic separator with handle

Pros as well as cons of rare earth magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• Their strength remains stable, and after approximately 10 years it decreases only by ~1% (according to research),
• Neodymium magnets are highly resistant to loss of magnetic properties caused by external interference,
• Thanks to the metallic finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
• The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Considering the possibility of accurate molding and customization to custom solutions, magnetic components can be manufactured in a broad palette of shapes and sizes, which amplifies use scope,
• Key role in high-tech industry – they serve a role in magnetic memories, brushless drives, advanced medical instruments, also technologically advanced constructions.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Drawbacks and weaknesses of neodymium magnets: tips and applications.

• At strong impacts they can crack, 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 lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
• We suggest a housing - magnetic holder, due to difficulties in realizing threads inside the magnet and complex forms.
• Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these products are able to disrupt the diagnostic process medical after entering the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

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

Breakaway force is the result of a measurement for optimal configuration, assuming:

• using a base made of low-carbon steel, acting as a circuit closing element
• with a thickness of at least 10 mm
• with an ground contact surface
• with total lack of distance (without paint)
• during detachment in a direction vertical to the plane
• in neutral thermal conditions

Magnet lifting force in use – key factors

During everyday use, the actual lifting capacity is determined by a number of factors, presented from the most important:

• Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Load vector – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
• Steel thickness – insufficiently thick steel does not close the flux, causing part of the power to be escaped into the air.
• Steel grade – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
• Smoothness – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
• Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance {between} the magnet’s surface and the plate reduces the load capacity.