NCM 10x13.5x5 / N38 - channel magnetic holder

Strengths as well as weaknesses of rare earth magnets.

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

• Their strength remains stable, and after around 10 years it drops only by ~1% (theoretically),
• They are noted for resistance to demagnetization induced by external magnetic fields,
• A magnet with a metallic gold surface has an effective appearance,
• Magnetic induction on the top side of the magnet is extremely intense,
• 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 modularity in shaping and the ability to modify to client solutions,
• Huge importance in high-tech industry – they serve a role in magnetic memories, brushless drives, diagnostic systems, and technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in miniature devices

Disadvantages of NdFeB magnets:

• At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 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 resistant to moisture, in case of application outdoors
• Limited ability of producing threads in the magnet and complicated forms - recommended is a housing - magnetic holder.
• Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these devices can 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

Maximum holding power of the magnet – what it depends on?

The declared magnet strength refers to the peak performance, obtained under optimal environment, meaning:

• on a base made of structural steel, optimally conducting the magnetic flux
• possessing a massiveness of at least 10 mm to avoid saturation
• characterized by smoothness
• without any air gap between the magnet and steel
• under axial force direction (90-degree angle)
• at room temperature

Practical lifting capacity: influencing factors

During everyday use, the actual holding force is determined by a number of factors, presented from crucial:

• Clearance – existence of any layer (rust, dirt, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Angle of force application – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
• Plate material – mild steel gives the best results. Higher carbon content reduce magnetic properties and lifting capacity.
• Smoothness – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
• Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate decreases the load capacity.