NEODYM

PERMANENT MAGNETS

NEODYM

Rare Earth Permanent Magnets

It represents the most modern family of permanent magnets and is made up of an alloy of Neodymium Iron Boron (NdFeB). Neodymium magnets are the most powerful permanent magnets on the market, with the maximum energy product, from 210 kJ / m3 to 420 kJ / m3. They are magnets with a formidable combination of high remanence and great coercive force. The uses can be all those in which excellent magnetic properties with small component size are required.

The powders of Nd-Fe-B are aligned through an oriented magnetic field and pressed into a mold, subsequently the sintering process takes place in an inert environment. The obtained Neodymium block is then mechanically worked to obtain the desired dimensions and shapes. These magnets have great potential to improve the performance of many applications considering their low cost. For this reason they will have the greatest impact on the development of permanent magnet devices in the near future.

TECHNICAL FEATURES NEODYM

COMPACT DESIGN

Neodymium magnets have the best magnetic flux properties in very small dimensions. They can be supplied in many forms.

HIGH PERFORMANCES

They have the highest energy density available on the market. For this reason they are used in many applications, they offer the best magnetic performance for same size.

EASY TO PROCESS

They are among the easiest magnets to cut and drill; they can be shaped in complex and irregular forms to suit special applications.

RESISTENCE

These magnets have a high coercive force, therefore a remarkable resistance to demagnetization.

MAGNETS COMPARED IN THE HYSTERESIS CYCLE
FEATURES OF DIFFERENT MAGNETS

APPLICATIONS

LIST OF MOST DIFFUSED APPLICATIONS

ELECTRIC MOTORS

Neodymium Permanent Magnet motors have characteristics with high torque values ​​and compact dimensions.

ALTERNATORS

The core of the alternators is made up of permanent magnet modules that significantly reduce the rotor losses, allowing higher efficiency than a traditional wound rotor generator.

WIND GENERATORS

Generators of this type can operate both at low and high speeds because they reduced friction. As a consequence they have a much higher operating range than classic wind and at the same time a much greater mechanical-electrical conversion efficiency.

SENSORS

Magnetic sensors are used to verify the position without contact. Use of NdFeB magnet offers very reduced dimension with high performance.

MRI

Magnetic Resonance is a non-invasive radiology exam that uses magnetic fields as the main energy.

MAGNETIC BEARINGS

The performance of the magnetic bearings will revolutionize the market, offering new opportunities for the creation of robust systems with these versatile products, economic and low consumption.

MAGNETIC SEPARATION

Permanent magnet separation systems are used in various sectors of the industry. From the production of chemical products to food, in light industry as well as in the production of minerals.

LIFTING MAGNETS

Flexibility and ease of use characterize the new neodymium magnet lifting systems.

FAQs

TECHNICAL AND OPERATING INFORMATIONS

Do Neodymium magnets lose their strength over time?

Neodymium magnets are the strongest and most durable; if they are not overheated or physically damaged, Neodymium magnets lose less than 1% of their strength in over 10 years. They do not lose their strength even if they are always kept in a working position.

What makes a Neodymium magnet stronger?

  • The magnetic properties of neodymium magnets depend on the composition of material alloy, the microstructure of the atom and the production technique used.
  • The most important factor is the tetragonal Nd2Fe14B crystal structure, this has an exceptionally high uniaxial direction, so each crystal of the material is magnetized preferentially along a specific axis.
  • The neodymium atom has a very large magnetic dipole moment (4 unpaired electrons). In a magnet unpaired electrons are aligned so that they rotate in the same direction, which generate the magnetic field.
  • The magnetic energy value of a Neodymium magnet is about 18 times greater than that of "ordinary" ferrite magnets in volume and 12 times in mass.

What defines the degree of a Neodymium magnet?

Neodymium magnets are classified according the value of the maximum energy product, it refers to the magnetic flux measurable per unit of volume. Higher values ​​indicate more powerful magnets. The letters following the numbering indicate the maximum operating temperatures.
  • N30-N55 – 80°C
  • N33M-N52M – 100°C
  • N30H-N50H – 120°C
  • N30SH-N48SH – 150°C
  • N28UH-N45UH – 180°C
  • N28EH-N42EH– 200°C
  • N28AH-N38AH– 220°C

Tolerances to be respected when making a Neodymium magnet:

Why you need to protect Neodymium magnets?

Moisture in the atmosphere may cause a NdFeB magnet to show signs of corrosion. The corrosion process is similar to that of rust formation - the structure of Neodymium magnets changes permanently resulting in a progressive loss of magnetic performance (the magnet will weaken and may even break up to become dust). To prevent this effect, a triple-layer coating is usually used - Nickel Copper Nickel. Unless otherwise requested, this coating is always applied to the magnet.

I have to worry about operating temperatures using Neodymium magnets?

Yes. NdFeB magnets are heat sensitive. If a magnet is heated above the indicated operating temperature, it will work at a fraction of its magnetic force. In the event that the so-called Curie temperature is reached (345 °C for Nd magnets) they will lose all their magnetic properties.