How Long is The Service Life of NdFeB Magnets?
There is no problem in maintaining the magnetic properties of NdFeB magnets for 20 to 30 years under normal working conditions.
One of the factors affecting the magnetic force of a magnet: is temperature.
Due to the types of magnets like the ferrite magnets, NdFeB magnets, bonded NdFeB magnets, AlNiCo, Smco, FeCrCo, injection-molded ferrite, etc; the corresponding temperature limit. In the general process of using the product, there will be no demagnetization phenomenon below the temperature limited by the magnet.
For example, the maximum temperature of the brushless external rotation motor is 80-100 degrees. In the case of ensuring that the demagnetization will not exceed 5%, the material with a magnet of 120 degrees is generally used. Therefore, the magnet will not be demagnetized and its life will depend entirely on its use. Material selection for product temperature and magnet temperature resistance.
The second factor that affects the magnetic force of the magnet is t he existence of the alternating magnetic field.
Anyone who has a certain understanding of magnets knows that they are divided into N, S poles or multi-poles. If there is another magnetic field around the magnet in use, it will cancel a part of the magnetic force. This is also what people say will demagnetize within the range of use temperature.
The third factor affecting the magnetic force of the magnet is the mechanical vibration.
This has a relationship with assembly. The magnet rubs against the product during the assembly process. Because the material is fragile, the body wears and the size becomes smaller. As a result, the magnet will gradually become weak.
Be sure to pay attention to this problem when buying magnets. There are a wide range of N series magnets on the market, but they can only work in an environment below 80 degrees. If the temperature exceeds, the magnetism will be weakened or completely demagnetized.
The absolute influence on the magnetic properties of NdFeB magnets is their working temperature.
Since the magnet forms dense magnetic induction lines after reaching saturation under the action of the external magnetic field when the external temperature rises, the regular movement from inside the magnet is destroyed. It also reduces its intrinsic coercive force, that is to say; the product of the corresponding Br value and the H value also changes with the change of the large magnetic energy product with the temperature.
The characteristics of NdFeB magnets can be divided into N.M.H.SH.UH.EH.AH, which matches the basic theoretical high temperature resistance value of 126.96.36.199.180.230. If strong magnetism is required, but the temperature resistance cannot meet the requirements, only samarium can be selected. Cobalt magnet.