RM R7 SUPER - 13000 Gs / N52 - magnetic distributor

Pros as well as cons of rare earth magnets.

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

• They do not lose power, even during approximately ten years – the decrease in lifting capacity is only ~1% (based on measurements),
• They possess excellent resistance to magnetism drop as a result of external fields,
• The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to look better,
• Magnets are characterized by excellent magnetic induction on the active area,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of precise modeling as well as adapting to precise requirements,
• Versatile presence in high-tech industry – they serve a role in computer drives, electromotive mechanisms, medical devices, as well as complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in compact constructions

Disadvantages of neodymium magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
• When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• We recommend casing - magnetic mount, due to difficulties in creating threads inside the magnet and complicated forms.
• Potential hazard to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
• Due to expensive raw materials, their price is higher than average,

Maximum lifting capacity of the magnet – what affects it?

Breakaway force was determined for the most favorable conditions, assuming:

• using a sheet made of mild steel, serving as a circuit closing element
• whose thickness is min. 10 mm
• with an ideally smooth touching surface
• with total lack of distance (no paint)
• for force acting at a right angle (in the magnet axis)
• at standard ambient temperature

Lifting capacity in real conditions – factors

Bear in mind that the magnet holding may be lower subject to elements below, starting with the most relevant:

• Distance – existence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
• Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of maximum force).
• Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
• Steel type – low-carbon steel gives the best results. Higher carbon content reduce magnetic properties and lifting capacity.
• Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet 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.