UMGB 75x28 [M8+M10] GW F200 +Lina GOBLIN / N38 - goblin magnetic holder

Advantages as well as disadvantages of rare earth magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They retain full power for almost 10 years – the drop is just ~1% (according to analyses),
• They show high resistance to demagnetization induced by external field influence,
• A magnet with a smooth silver surface has an effective appearance,
• They are known for high magnetic induction at the operating surface, which improves attraction properties,
• 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...
• Possibility of detailed machining as well as optimizing to precise requirements,
• Fundamental importance in modern technologies – they are used in data components, brushless drives, medical devices, also technologically advanced constructions.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
• When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and 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 resistant to moisture, when using outdoors
• We recommend a housing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex shapes.
• Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these magnets can be problematic in diagnostics medical in case of swallowing.
• Due to complex production process, their price exceeds standard values,

Maximum lifting capacity of the magnet – what affects it?

The force parameter is a result of laboratory testing executed under standard conditions:

• with the contact of a sheet made of special test steel, guaranteeing maximum field concentration
• with a thickness of at least 10 mm
• with an polished contact surface
• under conditions of gap-free contact (metal-to-metal)
• under axial application of breakaway force (90-degree angle)
• in stable room temperature

Lifting capacity in real conditions – factors

It is worth knowing that the magnet holding may be lower influenced by elements below, in order of importance:

• Distance – existence of any layer (rust, dirt, air) interrupts the magnetic circuit, 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 holding force drops drastically, often to levels of 20-30% of the nominal value.
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
• Steel grade – the best choice is high-permeability steel. Hardened steels may attract less.
• Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
• Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance {between} the magnet and the plate decreases the lifting capacity.