RM R7 SUPER - 13000 Gs / N52 - magnetic distributor

Strengths and weaknesses of rare earth magnets.

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

• They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
• They possess excellent resistance to magnetism drop due to opposing magnetic fields,
• Thanks to the metallic finish, the coating of nickel, gold-plated, or silver-plated gives an professional appearance,
• Magnets possess excellent magnetic induction on the surface,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• In view of the possibility of accurate forming and customization to custom requirements, NdFeB magnets can be modeled in a variety of forms and dimensions, which expands the range of possible applications,
• Key role in advanced technology sectors – they are used in magnetic memories, drive modules, diagnostic systems, as well as technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in compact constructions

Disadvantages of NdFeB magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
• When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 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 as well as corrosion.
• Due to limitations in producing nuts and complicated shapes in magnets, we propose using a housing - magnetic holder.
• Health risk related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these magnets can be problematic in diagnostics medical when they are in the body.
• With large orders the cost of neodymium magnets is a challenge,

Highest magnetic holding force – what it depends on?

Information about lifting capacity is the result of a measurement for the most favorable conditions, including:

• on a base made of mild steel, perfectly concentrating the magnetic flux
• possessing a massiveness of minimum 10 mm to ensure full flux closure
• with an ideally smooth touching surface
• with zero gap (without paint)
• under axial application of breakaway force (90-degree angle)
• in temp. approx. 20°C

Magnet lifting force in use – key factors

During everyday use, the real power depends on a number of factors, presented from the most important:

• Distance (between the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
• Direction of force – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
• Steel thickness – too thin plate does not accept the full field, causing part of the power to be lost to the other side.
• Material composition – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
• Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
• Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, however under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance {between} the magnet and the plate decreases the load capacity.