WM 34.5x24.3x17 / N38 - magnetic hanger

Pros and cons of neodymium magnets.

Besides their immense field intensity, neodymium magnets offer the following advantages:

• They retain magnetic properties for around ten years – the loss is just ~1% (based on simulations),
• Magnets perfectly defend themselves against loss of magnetization caused by ambient magnetic noise,
• Thanks to the elegant finish, the coating of Ni-Cu-Ni, gold-plated, or silver-plated gives an elegant appearance,
• Magnetic induction on the surface of the magnet turns out to be very high,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
• Possibility of detailed forming as well as adjusting to specific needs,
• Huge importance in modern industrial fields – they are utilized in mass storage devices, electric drive systems, medical devices, also technologically advanced constructions.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Disadvantages of NdFeB magnets:

• At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• 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
• Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Limited ability of making threads in the magnet and complicated forms - preferred is casing - mounting mechanism.
• Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small elements of these magnets are able to complicate diagnosis medical when they are in the body.
• With mass production the cost of neodymium magnets is economically unviable,

Optimal lifting capacity of a neodymium magnet – what affects it?

Magnet power was determined for ideal contact conditions, assuming:

• with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
• whose transverse dimension reaches at least 10 mm
• characterized by even structure
• under conditions of gap-free contact (metal-to-metal)
• under vertical force vector (90-degree angle)
• at standard ambient temperature

Practical lifting capacity: influencing factors

In practice, the actual lifting capacity results from several key aspects, presented from crucial:

• Clearance – the presence of foreign body (rust, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
• Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
• Material composition – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
• Surface finish – ideal contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
• Temperature – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the load capacity.