RM R7 SUPER - 13000 Gs / N52 - magnetic distributor

Pros as well as cons of neodymium magnets.

Apart from their consistent power, neodymium magnets have these key benefits:

• They do not lose strength, even during nearly 10 years – the decrease in strength is only ~1% (based on measurements),
• They do not lose their magnetic properties even under close interference source,
• A magnet with a smooth gold surface has an effective appearance,
• Magnetic induction on the working part of the magnet is strong,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
• In view of the potential of precise forming and customization to individualized solutions, neodymium magnets can be produced in a variety of geometric configurations, which makes them more universal,
• Versatile presence in future technologies – they find application in HDD drives, drive modules, medical equipment, as well as modern systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons of neodymium magnets and ways of using them

• At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• We suggest cover - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated shapes.
• Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

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

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

• using a sheet made of high-permeability steel, functioning as a ideal flux conductor
• whose transverse dimension is min. 10 mm
• with an polished contact surface
• under conditions of gap-free contact (surface-to-surface)
• during detachment in a direction vertical to the mounting surface
• at temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Effective lifting capacity impacted by working environment parameters, including (from priority):

• Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
• Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
• Steel grade – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
• Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
• Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

* Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet and the plate lowers the holding force.