UMGB 75x28 [M10x3] GW F200 PLATINIUM + Lina GOBLIN / N52 - goblin magnetic holder

Pros as well as cons of neodymium magnets.

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

• They have constant strength, and over around 10 years their attraction force decreases symbolically – ~1% (in testing),
• Magnets effectively resist against loss of magnetization caused by external fields,
• In other words, due to the smooth layer of gold, the element becomes visually attractive,
• They are known for high magnetic induction at the operating surface, which increases their power,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Thanks to the option of precise forming and customization to individualized projects, neodymium magnets can be produced in a broad palette of geometric configurations, which increases their versatility,
• Fundamental importance in modern industrial fields – they serve a role in mass storage devices, brushless drives, medical equipment, as well as modern systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in small systems

Cons of neodymium magnets and proposals for their use:

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in producing threads and complex forms in magnets, we recommend using casing - magnetic holder.
• Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these devices can complicate diagnosis medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Best holding force of the magnet in ideal parameters – what it depends on?

Magnet power is the result of a measurement for ideal contact conditions, taking into account:

• with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
• with a cross-section of at least 10 mm
• characterized by smoothness
• under conditions of no distance (surface-to-surface)
• for force applied at a right angle (in the magnet axis)
• at temperature room level

Practical lifting capacity: influencing factors

Effective lifting capacity impacted by specific conditions, including (from priority):

• Gap (between the magnet and the metal), since even a very small distance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
• Angle of force application – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
• Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the flux to be lost into the air.
• Material type – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
• Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
• Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was measured by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate reduces the load capacity.