MPL 5x5x1.5 / N38 - lamellar magnet

Pros and cons of NdFeB magnets.

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

• They retain full power for nearly 10 years – the drop is just ~1% (in theory),
• Magnets effectively protect themselves against demagnetization caused by ambient magnetic noise,
• In other words, due to the shiny surface of nickel, the element gains visual value,
• Magnets are characterized by huge magnetic induction on the active area,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures approaching 230°C and above...
• Due to the ability of precise forming and customization to unique requirements, NdFeB magnets can be created in a wide range of forms and dimensions, which expands the range of possible applications,
• Universal use in electronics industry – they are utilized in HDD drives, brushless drives, medical equipment, as well as other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in miniature devices

Characteristics of disadvantages of neodymium magnets and ways of using them

• They are fragile 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
• NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as 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
• They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Limited possibility of producing threads in the magnet and complicated shapes - preferred is cover - magnet mounting.
• Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
• Due to neodymium price, their price exceeds standard values,

Detachment force of the magnet in optimal conditions – what contributes to it?

The force parameter is a theoretical maximum value performed under the following configuration:

• with the application of a sheet made of special test steel, ensuring maximum field concentration
• possessing a thickness of min. 10 mm to avoid saturation
• with an polished touching surface
• under conditions of gap-free contact (surface-to-surface)
• under perpendicular force direction (90-degree angle)
• at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Effective lifting capacity impacted by working environment parameters, mainly (from most important):

• Clearance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Load vector – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
• Base massiveness – too thin steel causes magnetic saturation, causing part of the flux to be wasted into the air.
• Plate material – low-carbon steel attracts best. Alloy admixtures reduce magnetic properties and holding force.
• Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
• Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.