UMP 75x25 [M10x3] GW F200 PLATINIUM / N52 - search holder

Pros as well as cons of neodymium magnets.

Besides their immense pulling force, neodymium magnets offer the following advantages:

• They retain magnetic properties for almost ten years – the loss is just ~1% (based on simulations),
• They are resistant to demagnetization induced by presence of other magnetic fields,
• A magnet with a smooth silver surface has an effective appearance,
• The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
• Neodymium magnets are characterized by extremely 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...
• Possibility of individual machining as well as optimizing to specific requirements,
• Huge importance in modern technologies – they serve a role in computer drives, brushless drives, diagnostic systems, also complex engineering applications.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
• When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power 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 recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• We recommend a housing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated forms.
• Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these products can complicate diagnosis medical after entering the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Highest magnetic holding force – what affects it?

Breakaway force was defined for optimal configuration, including:

• with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
• whose thickness reaches at least 10 mm
• with a plane perfectly flat
• under conditions of no distance (metal-to-metal)
• for force acting at a right angle (in the magnet axis)
• in stable room temperature

Lifting capacity in practice – influencing factors

During everyday use, the real power is determined by many variables, ranked from crucial:

• Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces 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 surface is typically several times lower (approx. 1/5 of the lifting capacity).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Steel type – mild steel gives the best results. Alloy steels decrease magnetic permeability and holding force.
• Surface structure – the more even the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
• Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet’s surface and the plate lowers the holding force.