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Permanent magnet motors are widely used, but how many people know the categories of permanent magnet materials? What are the characteristics and advantages and disadvantages of different permanent magnet materials? Which models should be selected under different environments and applications? This article is based on such a starting point, to do some characteristic analysis of permanent magnet materials, especially "NdFeB and Samarium Cobalt" rare earth permanent magnets.
     Rare earth permanent magnets (samarium cobalt, neodymium iron boron) are the most widely used in air compressors, most of which are made by sintering technology. At present, about 1/3 of rare earth permanent magnet materials are used in the permanent magnet motor market. .
     Rare earth permanent magnets are also known permanent magnet materials with the highest comprehensive performance. They are 8 to 10 times higher than permanent ferrites and 3 to 5 times higher than AlNiCo permanent magnet materials, so they are widely used.
  Samarium cobalt permanent magnet is a magnetic material composed of samarium, cobalt and other metal rare earth materials. Contains SmCo5 and Sm2Co17. Neodymium iron boron (Ne2Fe14B) is a tetragonal crystal formed by neodymium, iron and boron.
     Before analyzing the characteristics of the two rare earth permanent magnet materials, samarium cobalt (SMCo) and neodymium iron boron (NdFeB), we need to understand the following two definitions:
     ● Larger magnetic energy product: The larger the magnetic energy product, the less magnetic material is required to produce the same effect. So the bigger the BH, the better
     ● Higher working temperature: When the temperature is higher than this temperature, the magnetism drops sharply and cannot work normally. Part of the magnetism can be restored when the temperature falls back to normal levels.
     Note: The maximum magnetic energy area of ​​NdFeB is affected by the working temperature. For example, to achieve the maximum working temperature of 200 ℃, according to the current sintering technology, only a large magnetic energy product of 38MGOe can be achieved.