The permanent magnets commonly used in permanent magnet motors include sintered magnets and bonded magnets. The main types are AlNiCo, ferrite, samarium cobalt, neodymium iron boron, and so on. In this article, we will take a deeper look at the above 4 types of magnets.
Alnico permanent magnet is the earliest widely used permanent magnet, and its preparation process and technology are relatively mature. Currently, there are factories in Japan, the United States, Europe, Russia, and China.
In the 1950s, ferrite began to develop vigorously. Especially in the 1970s, strontium ferrite with better performance in coercivity and magnetism was put into production in large quantities, rapidly expanding the use of permanent ferrite. As a non-metallic magnetic material, ferrite does not have the disadvantages of metal permanent magnet materials that are easy to oxidize, having low Curie temperature, and high cost, so it is very popular.
Samarium cobalt magnets are permanent magnets with excellent magnetic properties that emerged in the mid-1960s and have very stable properties. Samarium-cobalt magnets are particularly suitable for manufacturing motors in terms of magnetic properties. However, due to their high price, they are mainly used in the research and development of aviation, aerospace, weapons, and other military motors and high-performance motors in high-tech fields where the price is not the main factor.
NdFeB magnets are alloys of neodymium and iron oxide. With extremely high magnetic energy product and coercive force, while the advantages of high energy density, NdFeB permanent magnets have been widely used in modern industry and electronic technology. This makes it possible to reduce the size, weight, and thickness of equipment such as instrumentation, electroacoustic motors, and magnetic separation and magnetization. Because neodymium magnets contain a large amount of neodymium and iron, they are easy to rust. Surface chemical passivation is one of the best solutions to the corrosion of neodymium magnets.
Thank you for reading our article and we hope it can help you to know the magnets commonly used in permanent magnet motors better. If you want to learn more about magnets, we would like to advise you to visit Stanford Magnets for more information.
As a leading magnet supplier across the world, Stanford Magnets has been involved in R&D, manufacturing, and sales of magnets since the 1990s. It provides customers with high-quality permanent magnets like SmCo magnets, neodymium magnets, AlNiCo magnets, and ferrite magnets (ceramic magnets) at a very competitive price.