Knowledge of motor magnets
Source of the article:Shenzhen Ya Teng Motor Co., LtdDate of Publication:2016-10-28

Knowledge of motor magnets

There are many types of magnets, generally divided into permanent magnet and soft magnetic two categories, we call the magnet, generally refers to the permanent magnet

Permanent magnets are divided into two categories:

The first category is: metal alloy magnet including NdFeB magnet Nd2Fe14B), SmCo magnet (SmCo), alnico magnet (ALNiCO)

The second largest category is: ferrite permanent magnet material (Ferrite)

1, NdFeB magnets: It is found that the highest commercial performance magnet, known as the magnetic king, has a very high magnetic properties of its maximum energy product (BHmax) higher than ferrite (Ferrite) more than 10 times. Its own mechanical processing performance is also quite good. Operating temperature up to 200 ℃. And its hard texture, stable performance, a very good value for money, so its application is extremely extensive. But because of its strong chemical activity, it must be the surface coating. (Such as plating Zn, Ni, electrophoresis, passivation, etc.).

2. Ferrite magnets: Its main raw materials include BaFe12O19 and SrFe12O19. Because the ferrite magnets have good temperature resistance, low cost, moderate performance, has become the most widely used permanent magnets. It is made of ceramic technology, hard texture, is a brittle material.

3. AlNiCo magnets: aluminum, nickel, cobalt, iron and other trace metals consisting of an alloy. Casting process can be processed into different sizes and shapes, machinability is very good. Cast aluminum nickel cobalt permanent magnet has a minimum reversible temperature coefficient, the working temperature can be as high as 600 ℃ above. AlNiCo permanent magnet products are widely used in various instrumentation and other applications.

4, SmCo (SmCo) according to the different components into SmCo5 and Sm2Co17. Because of its expensive materials and its development is limited. SmCo (SmCo) as a rare earth permanent magnet, not only has a high energy product (14-28MGOe), reliable coercivity and good temperature characteristics. Compared with NdFeB magnets, samarium cobalt magnet is more suitable for working in high temperature environments.


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