MPL 40x20x5 / N38 - lamellar magnet

Pros as well as cons of NdFeB magnets.

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

• They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
• Neodymium magnets remain highly resistant to magnetic field loss caused by magnetic disturbances,
• In other words, due to the smooth surface of nickel, the element is aesthetically pleasing,
• Magnets are distinguished by very high magnetic induction on the outer layer,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to the ability of accurate molding and customization to custom needs, NdFeB magnets can be produced in a broad palette of shapes and sizes, which amplifies use scope,
• Versatile presence in advanced technology sectors – they are used in hard drives, electric motors, medical equipment, also multitasking production systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
• When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
• We recommend cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated forms.
• Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
• With mass production the cost of neodymium magnets can be a barrier,

Maximum magnetic pulling force – what it depends on?

Breakaway force was determined for the most favorable conditions, including:

• with the application of a sheet made of special test steel, guaranteeing maximum field concentration
• with a cross-section of at least 10 mm
• with an ideally smooth touching surface
• under conditions of no distance (surface-to-surface)
• during pulling in a direction vertical to the plane
• at room temperature

Practical lifting capacity: influencing factors

Holding efficiency impacted by working environment parameters, such as (from priority):

• Distance – existence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
• Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
• Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
• Material type – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
• Plate texture – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
• Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, however under shearing force the lifting capacity is smaller. In addition, even a slight gap {between} the magnet’s surface and the plate reduces the holding force.