MPL 25x15x2 / N38 - lamellar magnet

Advantages as well as disadvantages of NdFeB magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• Their magnetic field is maintained, and after around 10 years it decreases only by ~1% (according to research),
• Magnets effectively defend themselves against demagnetization caused by foreign field sources,
• By applying a smooth coating of nickel, the element has an aesthetic look,
• Magnets have maximum magnetic induction on the active area,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
• Due to the potential of free forming and customization to custom requirements, magnetic components can be produced in a broad palette of geometric configurations, which expands the range of possible applications,
• Key role in innovative solutions – they are utilized in magnetic memories, electric drive systems, medical devices, also multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in compact constructions

Characteristics of disadvantages of neodymium magnets: tips and applications.

• At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
• Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in producing threads and complicated forms in magnets, we recommend using cover - magnetic mechanism.
• Potential hazard to health – tiny shards of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these products are able to disrupt the diagnostic process medical in case of swallowing.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Optimal lifting capacity of a neodymium magnet – what it depends on?

Breakaway force was defined for ideal contact conditions, assuming:

• on a base made of structural steel, effectively closing the magnetic field
• with a thickness minimum 10 mm
• with a plane perfectly flat
• with direct contact (no impurities)
• for force applied at a right angle (pull-off, not shear)
• in neutral thermal conditions

Key elements affecting lifting force

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

• Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
• Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
• Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
• Material composition – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
• Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, however under shearing force the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate decreases the holding force.