MPL 40x10x4 / N38 - lamellar magnet

Strengths and weaknesses of NdFeB magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• They retain full power for almost 10 years – the loss is just ~1% (based on simulations),
• They maintain their magnetic properties even under close interference source,
• A magnet with a smooth gold surface has an effective appearance,
• The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
• Due to the ability of flexible shaping and customization to custom needs, magnetic components can be manufactured in a broad palette of geometric configurations, which increases their versatility,
• Huge importance in modern industrial fields – they serve a role in computer drives, electromotive mechanisms, advanced medical instruments, as well as modern systems.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. 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 strength (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 extremely resistant to heat
• They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Due to limitations in creating nuts and complicated shapes in magnets, we recommend using casing - magnetic mount.
• Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum magnetic pulling force – what affects it?

The declared magnet strength concerns the maximum value, measured under ideal test conditions, specifically:

• using a plate made of high-permeability steel, acting as a circuit closing element
• whose thickness equals approx. 10 mm
• with an ground contact surface
• without any air gap between the magnet and steel
• for force applied at a right angle (in the magnet axis)
• in neutral thermal conditions

Magnet lifting force in use – key factors

In practice, the actual lifting capacity is determined by many variables, ranked from the most important:

• Gap between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
• Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be lost to the other side.
• Metal type – not every steel reacts the same. High carbon content worsen the attraction effect.
• Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
• Temperature influence – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet and the plate decreases the load capacity.