MP 30x6x10 / N38 - ring magnet

Strengths as well as weaknesses of rare earth magnets.

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

• They have constant strength, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
• They have excellent resistance to magnetism drop as a result of external magnetic sources,
• In other words, due to the metallic finish of gold, the element looks attractive,
• Neodymium magnets achieve maximum magnetic induction on a small area, which ensures high operational effectiveness,
• 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...
• Possibility of exact creating as well as optimizing to specific needs,
• Fundamental importance in electronics industry – they are commonly used in mass storage devices, electric motors, medical equipment, as well as multitasking production systems.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Characteristics of disadvantages of neodymium magnets: tips and applications.

• To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
• Due to limitations in producing threads and complex shapes in magnets, we propose using cover - magnetic mechanism.
• Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these magnets can complicate diagnosis medical in case of swallowing.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum magnetic pulling force – what it depends on?

The force parameter is a measurement result executed under standard conditions:

• with the contact of a sheet made of special test steel, ensuring full magnetic saturation
• with a cross-section minimum 10 mm
• with a plane free of scratches
• under conditions of no distance (metal-to-metal)
• during pulling in a direction perpendicular to the plane
• at ambient temperature room level

Practical lifting capacity: influencing factors

Please note that the working load may be lower depending on elements below, starting with the most relevant:

• Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
• Angle of force application – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
• Steel grade – ideal substrate is pure iron steel. Stainless steels may attract less.
• Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
• Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance {between} the magnet and the plate decreases the lifting capacity.