MP 30x6x10 / N38 - ring magnet

Strengths and weaknesses of rare earth magnets.

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

• They retain attractive force for almost ten years – the drop is just ~1% (based on simulations),
• They possess excellent resistance to weakening of magnetic properties due to external fields,
• A magnet with a metallic nickel surface is more attractive,
• They show high magnetic induction at the operating surface, which improves attraction properties,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
• Due to the potential of free shaping and customization to unique solutions, NdFeB magnets can be produced in a wide range of shapes and sizes, which increases their versatility,
• Key role in modern industrial fields – they are commonly used in HDD drives, electric drive systems, medical devices, as well as industrial machines.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets: tips and applications.

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• Neodymium magnets lose 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
• Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in creating nuts and complex forms in magnets, we recommend using a housing - magnetic mechanism.
• Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these products are able to complicate diagnosis medical after entering the body.
• With large orders the cost of neodymium magnets is a challenge,

Optimal lifting capacity of a neodymium magnet – what affects it?

Information about lifting capacity was defined for ideal contact conditions, assuming:

• using a plate made of high-permeability steel, functioning as a magnetic yoke
• possessing a thickness of minimum 10 mm to avoid saturation
• characterized by smoothness
• without the slightest clearance between the magnet and steel
• during pulling in a direction vertical to the mounting surface
• at ambient temperature room level

Practical lifting capacity: influencing factors

It is worth knowing that the magnet holding will differ depending on elements below, in order of importance:

• Distance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
• Load vector – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
• Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
• Surface quality – the more even the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
• Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance {between} the magnet’s surface and the plate lowers the load capacity.