Neodymium Magnets

Different Types of Strong Permanent Magnets

Strong magnets can be SmCo material which known as rare earth magnets, when the working temperature is above 180℃, its maximum magnetic energy product (BHmax), coercivity, temperature stability and chemical stability are better than those of NdFeB magnets.The maximum energy product (BHmax) of SmCo magnets ranges from 16 MGOe to 32 MGOe, and its theoretical limit is 34 MGOe

The magnetic energy product of ferrite (ceramic) magnet is much lower than that of NdFeB and SmCo, but big ferrite magnets that have powerful magnetism are also called strong magnets.

Besides the above permanent magnetic material for sale, some permanent magnetic assemblies (such as pot magnets, strong fishing magnets, hook magnets) are also called strong magnets.

Here we just introduce some common shapes of neodymium strong magnets, and mainly for sintered neodymium magnets. Because of the high machinability, it can be machined into different shapes and very wide size range is available for each shape. Besides of disc, cylinder, ring and block, neodymium magnets can be machined into some special shapes, for example, countersunk neodymium magnets, sphere neodymium magnets, neodymium cone magnets, neodymium arc & segment magnets, and neodymium convex magnets.

How to Estimate Permanent Strong Magnets Qualified or Not?

Estimate strong magnets qualified or not, mainly decided by these aspects:

Magnetic performance property: magnetic performance of a permanent strong magnet depends on the formulation, which mainly includes remanence, coercivity, and magnetic energy product. Magnetic properties are the most important aspect of magnets and need professional instrument testing.

Tolerance of the magnets: the tolerance accuracy decided by the machineability of a factory. The machining equipment keeps updated as per market needs. Efficient devices and automation trends of industrial processing, not only meet the need of increasing magnets accuracy but also save manpower and cost.

Appearance of the magnets: appearance evaluation firstly depends on whether there are defects in electroplating; secondly, see if there is a lack of angle in the magnets.

Permanent Magnet Application

Neodymium strong magnets are more and more used for fabrics, such as neodymium sew-in magnets which can be sewed in curtains, and also sewed in clothes used as waterproof magnetic buttons.

Some small strong magnets are used for decorating fridges or used on fridges or whiteboards as memo magnets.

Strong neodymium magnets for heavy-duty hanging, the big neodymium hook magnets have hundreds of kilograms holding force and are used as magnetic ceiling hooks and wall hooks.

Strong magnets of neodymium are used for magnet fishing and searching, neodymium search magnets have a strong magnetic force and are used to get out the metal objects that fell to the bottom of the river and wall.

Strong neodymium magnets are widely used for producing motors, by using neodymium magnetic tiles, the performance of motors is more stable.

Strong neodymium magnets are used for making speakers, due to the outstanding magnetic performance, strong neodymium magnets make the size of the speaker the smallest.

Neodymium strong magnets are widely used for magnetic separating, by using magnetic separator of neodymium strong magnets, the metal impurities are filtered more thoroughly from food or grain.


Physical Specification Of Neodymium Magnets

Surface Treatments for Neodymium Magnets

Best Temperatures to the Use of Neodymium Magnets

Every grade of neodymium magnet has a specific maximum working temperature as the below list,the best temperature should not exceed the maximum of the neodymium magnets.

The maximum working temperature listed above are values just associated with each grade of permanent magnet materials.  Actual values in your application may vary depend other factors, including the shape of the magnet, the performance coefficient or load line, and how it is used in a magnetic circuit.