UMP 75x25 [M10x3] GW F200 PLATINIUM / N52 - search holder

Advantages and disadvantages of neodymium magnets.

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

• They do not lose power, even during nearly ten years – the decrease in strength is only ~1% (theoretically),
• They possess excellent resistance to magnetism drop when exposed to external fields,
• The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to look better,
• Neodymium magnets ensure maximum magnetic induction on a small area, which increases force concentration,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
• Thanks to the possibility of free forming and adaptation to custom requirements, magnetic components can be modeled in a variety of forms and dimensions, which expands the range of possible applications,
• Wide application in modern technologies – they are used in magnetic memories, electric motors, diagnostic systems, also industrial machines.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in miniature devices

Disadvantages of neodymium magnets:

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
• When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and 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. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
• We suggest casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
• Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these magnets can complicate diagnosis medical when they are in the body.
• Due to expensive raw materials, their price is relatively high,

Maximum magnetic pulling force – what it depends on?

Magnet power is the result of a measurement for optimal configuration, taking into account:

• using a plate made of low-carbon steel, functioning as a circuit closing element
• with a cross-section no less than 10 mm
• characterized by smoothness
• with direct contact (without coatings)
• for force applied at a right angle (in the magnet axis)
• at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

During everyday use, the real power is determined by a number of factors, listed from crucial:

• Gap (between the magnet and the plate), since even a very small distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
• Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
• Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
• Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
• Thermal factor – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance {between} the magnet and the plate decreases the lifting capacity.