NC NeoCube fi 5 mm kuleczki srebrne / N38 - neocube

Pros and cons of neodymium magnets.

Besides their exceptional strength, neodymium magnets offer the following advantages:

• They do not lose magnetism, even during approximately ten years – the drop in lifting capacity is only ~1% (based on measurements),
• They are resistant to demagnetization induced by external field influence,
• Thanks to the smooth finish, the plating of Ni-Cu-Ni, gold-plated, or silver-plated gives an visually attractive appearance,
• Neodymium magnets ensure maximum magnetic induction on a contact point, which allows for strong attraction,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Thanks to versatility in designing and the capacity to customize to complex applications,
• Key role in future technologies – they find application in hard drives, electric drive systems, diagnostic systems, also complex engineering applications.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages of neodymium magnets:

• They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
• When exposed to high temperature, neodymium magnets experience 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
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• Due to limitations in realizing nuts and complicated forms in magnets, we recommend using a housing - magnetic mechanism.
• Potential hazard resulting from small fragments of magnets are risky, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical when they are in the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The lifting capacity listed is a theoretical maximum value performed under standard conditions:

• using a base made of high-permeability steel, serving as a ideal flux conductor
• whose thickness reaches at least 10 mm
• with a surface perfectly flat
• with total lack of distance (no coatings)
• during pulling in a direction vertical to the mounting surface
• in neutral thermal conditions

Determinants of practical lifting force of a magnet

Real force is affected by specific conditions, such as (from priority):

• Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
• Direction of force – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
• Steel thickness – too thin plate causes magnetic saturation, causing part of the power to be lost into the air.
• Steel grade – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
• Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
• Thermal factor – hot environment reduces 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, whereas under parallel forces the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate lowers the holding force.