MW 29x10 / N38 - cylindrical magnet

Advantages as well as disadvantages of rare earth magnets.

Besides their immense pulling force, neodymium magnets offer the following advantages:

• Their strength is maintained, and after approximately 10 years it drops only by ~1% (theoretically),
• They possess excellent resistance to magnetism drop when exposed to external magnetic sources,
• In other words, due to the smooth surface of gold, the element is aesthetically pleasing,
• Magnetic induction on the top side of the magnet remains maximum,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures reaching 230°C and above...
• Possibility of precise modeling and adapting to defined requirements,
• Wide application in advanced technology sectors – they find application in data components, electric drive systems, medical devices, as well as complex engineering applications.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Problematic aspects of neodymium magnets and proposals for their use:

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. 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.
• They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Due to limitations in realizing threads and complicated shapes in magnets, we recommend using a housing - magnetic holder.
• Potential hazard to health – tiny shards of magnets are risky, if swallowed, which becomes key in the context of child safety. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical after entering the body.
• With large orders the cost of neodymium magnets is economically unviable,

Maximum lifting capacity of the magnet – what affects it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, including:

• using a base made of low-carbon steel, serving as a ideal flux conductor
• with a thickness of at least 10 mm
• characterized by even structure
• under conditions of ideal adhesion (metal-to-metal)
• during pulling in a direction vertical to the plane
• in neutral thermal conditions

Determinants of lifting force in real conditions

Bear in mind that the magnet holding will differ influenced by elements below, in order of importance:

• Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) 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 (typically approx. 20-30% of nominal force).
• Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Metal type – different alloys attracts identically. Alloy additives weaken the interaction with the magnet.
• Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
• Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under parallel forces the holding force is lower. Additionally, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.