XT-4 magnetyzery CO i WODY użytkowej - XT-4 magnetizer

Advantages and disadvantages of NdFeB magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
• Magnets very well defend themselves against loss of magnetization caused by foreign field sources,
• In other words, due to the reflective finish of nickel, the element gains a professional look,
• Neodymium magnets create maximum magnetic induction on a their surface, which allows for strong attraction,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
• Thanks to modularity in forming and the capacity to modify to specific needs,
• Huge importance in future technologies – they are utilized in magnetic memories, electric motors, diagnostic systems, as well as technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in miniature devices

Problematic aspects of neodymium magnets and proposals for their use:

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
• When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength 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 rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Limited ability of creating nuts in the magnet and complicated forms - preferred is a housing - magnet mounting.
• Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these products are able to disrupt the diagnostic process medical after entering the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Maximum lifting capacity of the magnet – what contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, including:

• using a base made of high-permeability steel, serving as a magnetic yoke
• whose thickness equals approx. 10 mm
• with an ideally smooth contact surface
• without the slightest insulating layer between the magnet and steel
• for force applied at a right angle (in the magnet axis)
• at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Please note that the working load will differ depending on the following factors, starting with the most relevant:

• Clearance – the presence of any layer (paint, tape, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Steel thickness – too thin steel does not close the flux, causing part of the power to be wasted to the other side.
• Plate material – low-carbon steel attracts best. Higher carbon content decrease magnetic permeability and holding force.
• Smoothness – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
• Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity was assessed using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a slight gap {between} the magnet’s surface and the plate reduces the holding force.