UMP 75x24 [M8+M10] GW F200 Lina / N38 - search holder

Strengths and weaknesses of neodymium magnets.

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

• They retain magnetic properties for almost ten years – the loss is just ~1% (according to analyses),
• Magnets perfectly resist against demagnetization caused by external fields,
• By using a decorative layer of gold, the element presents an modern look,
• Magnets have very high magnetic induction on the active area,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures approaching 230°C and above...
• Possibility of accurate machining as well as modifying to specific requirements,
• Universal use in electronics industry – they are utilized in mass storage devices, brushless drives, medical devices, as well as other advanced devices.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

What to avoid - cons of neodymium magnets: tips and applications.

• Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
• 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.
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
• Limited possibility of producing nuts in the magnet and complicated shapes - recommended is a housing - mounting mechanism.
• Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
• Due to complex production process, their price is relatively high,

Optimal lifting capacity of a neodymium magnet – what it depends on?

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

• with the contact of a sheet made of low-carbon steel, ensuring maximum field concentration
• with a cross-section no less than 10 mm
• with an polished contact surface
• under conditions of gap-free contact (metal-to-metal)
• during pulling in a direction vertical to the plane
• at standard ambient temperature

Key elements affecting lifting force

Bear in mind that the application force will differ depending on elements below, starting with the most relevant:

• Gap (between the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
• Direction of force – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
• Plate material – mild steel gives the best results. Alloy admixtures reduce magnetic properties and holding force.
• Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
• Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a small distance {between} the magnet and the plate decreases the load capacity.