SM 32x300 [2xM8] / N52 - magnetic separator

Strengths and weaknesses of NdFeB magnets.

Apart from their consistent power, neodymium magnets have these key benefits:

• They virtually do not lose power, because even after ten years the performance loss is only ~1% (according to literature),
• Magnets very well defend themselves against demagnetization caused by ambient magnetic noise,
• In other words, due to the aesthetic finish of silver, the element is aesthetically pleasing,
• Magnetic induction on the top side of the magnet remains impressive,
• 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...
• Due to the possibility of free molding and adaptation to specialized solutions, NdFeB magnets can be manufactured in a variety of forms and dimensions, which amplifies use scope,
• Wide application in modern industrial fields – they find application in computer drives, motor assemblies, precision medical tools, as well as multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in compact constructions

Disadvantages of NdFeB magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and 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 - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• We recommend a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complicated forms.
• Health risk resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small components of these magnets are able to complicate diagnosis medical after entering the body.
• Due to complex production process, their price is higher than average,

Maximum magnetic pulling force – what affects it?

The lifting capacity listed is a measurement result executed under specific, ideal conditions:

• using a base made of high-permeability steel, serving as a magnetic yoke
• with a thickness no less than 10 mm
• characterized by even structure
• under conditions of gap-free contact (surface-to-surface)
• for force acting at a right angle (pull-off, not shear)
• at ambient temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

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

• Gap (betwixt the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
• Angle of force application – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
• Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
• Steel grade – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
• Smoothness – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
• Thermal factor – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance {between} the magnet’s surface and the plate decreases the lifting capacity.