UMP 75x24 [M8+M10] GW F 200 kg - search holder

Pros and cons of neodymium magnets.

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

• They retain magnetic properties for almost ten years – the drop is just ~1% (according to analyses),
• Neodymium magnets are characterized by extremely resistant to loss of magnetic properties caused by external interference,
• In other words, due to the metallic finish of silver, the element gains a professional look,
• The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
• 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...
• Possibility of individual creating and optimizing to defined needs,
• Fundamental importance in innovative solutions – they are utilized in magnetic memories, motor assemblies, medical equipment, also multitasking production systems.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
• Due to limitations in realizing threads and complex shapes in magnets, we recommend using a housing - magnetic mechanism.
• Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. Additionally, tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum holding power of the magnet – what affects it?

The specified lifting capacity refers to the maximum value, measured under laboratory conditions, meaning:

• using a plate made of low-carbon steel, functioning as a ideal flux conductor
• possessing a massiveness of minimum 10 mm to avoid saturation
• characterized by smoothness
• under conditions of no distance (metal-to-metal)
• for force acting at a right angle (in the magnet axis)
• at conditions approx. 20°C

Determinants of lifting force in real conditions

During everyday use, the actual holding force is determined by a number of factors, presented from the most important:

• Air gap (between the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to varnish, rust or debris).
• Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
• Material composition – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
• Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
• Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as fivefold. In addition, even a slight gap {between} the magnet and the plate reduces the holding force.