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What are the magnet materials commonly used in permanent magnet motors?

What are the magnet materials commonly used in permanent magnet motors?

Permanent magnet materials commonly used in the motor include sintered magnets and bonding magnets, the main types are aluminum-nickel-cobalt, ferrite, samarium cobalt, NdFeB and so on.

Alnico: Alnico permanent magnet material is the earliest and widely used permanent magnet material, and its preparation process and technology are relatively mature.At present, there are factories in Japan, the United States, Europe, Russia and China.Among the large-scale production enterprises, the output of Hangzhou permanent magnet is currently the first in China, with an annual capacity of 3000 tons.
Permanent magnet ferrite material: entered the 50's, ferrite began to flourish, especially in the 70's, in coercivity, magnetic energy machine performance better strontium-ferrite into production in large numbers, rapidly expanded the use of permanent magnet ferrite.As a nonmetallic magnetic material, ferrite is not as easy to oxidize as metal permanent magnet materials, low Curie temperature and high cost, so it is very popular.
Samarium cobalt material: the rise of the 20th century in the mid-1960s, excellent magnetic permanent magnet materials, and very stable performance.Samarium cobalt is particularly suitable for the manufacturing of electric motors from the aspect of magnetic properties, but due to its high price, it is mainly used in the research and development of aviation, aerospace, weapons and other military electric motors and high performance and price is not the main factor in the high-tech field of electric motors.
NdFeB material: NdFeB magnetic material is neodymium, iron oxide and other alloy, also known as magnetic steel.With extremely high magnetic energy product and the advantages of high energy density, NdFeB permanent magnet material has been widely used in modern industry and electronic technology, so as to make instruments, electroacoustic motors, magnetic separation and magnetization equipment miniaturization, light weight, thin become possible.It is prone to rust due to its high content of neodymium and iron.Surface chemical passivation is one of the best solutions.
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