MPL 50x20x5 / N38 - lamellar magnet

Strengths as well as weaknesses of neodymium magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

• They retain attractive force for almost ten years – the drop is just ~1% (according to analyses),
• Neodymium magnets prove to be highly resistant to demagnetization caused by external field sources,
• By applying a smooth coating of nickel, the element has an proper look,
• Magnetic induction on the working part of the magnet turns out to be very high,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
• Possibility of detailed forming and adapting to atypical applications,
• Key role in modern technologies – they are commonly used in hard drives, electric drive systems, advanced medical instruments, as well as other advanced devices.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages of NdFeB magnets:

• At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in realizing nuts and complex shapes in magnets, we recommend using cover - magnetic mechanism.
• Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
• With large orders the cost of neodymium magnets is economically unviable,

Breakaway strength of the magnet in ideal conditions – what it depends on?

Magnet power is the result of a measurement for optimal configuration, taking into account:

• with the use of a yoke made of low-carbon steel, ensuring maximum field concentration
• with a cross-section no less than 10 mm
• with an ideally smooth contact surface
• with direct contact (no impurities)
• under perpendicular application of breakaway force (90-degree angle)
• at temperature room level

Lifting capacity in real conditions – factors

Holding efficiency impacted by working environment parameters, mainly (from most important):

• Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
• Material composition – different alloys attracts identically. Alloy additives worsen the attraction effect.
• Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
• Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance {between} the magnet and the plate lowers the load capacity.