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

Comprehensive analysis of motor magnets: Permanent magnet materials commonly used in motors include sintered magnets and bonded magnets. The main types are AlNiCo, ferrite, samarium cobalt, neodymium iron boron, etc. Al-Ni-Co: Al-Ni-Co permanent magnet material is the earliest widely used permanent magnet material, and its preparation process and technology are relatively mature. Permanent ferrite materials: In the 1950s, ferrites began to flourish. Especially in the 1970s, strontium ferrites with better performance in coercivity and magnetism were put into production in large quantities, and permanent ferrites were rapidly expanded. the use of. As a non-metallic magnetic material, ferrite does not have the disadvantages of metal permanent magnet materials that are easy to oxidize, have low Curie temperature and high cost, so it is very popular. Samarium cobalt material: A permanent magnet material with excellent magnetic properties that emerged in the mid-1960s, and its performance is very stable. Samarium cobalt is particularly suitable for manufacturing motors in terms of magnetic properties, but due to its high price, it is mainly used for research and development of military motors such as aviation, aerospace, weapons and high-performance motors in high-tech fields where price is not the main factor. NdFeB material: NdFeB magnetic material is an alloy of neodymium, iron oxide, etc., also known as magnet steel. With extremely high magnetic energy product and coercive force, and at the same time, the advantages of high energy density, NdFeB permanent magnet materials have been widely used in modern industry and electronic technology, so as to make instrumentation, electroacoustic motors, magnetic separation magnetization and other equipment miniaturization, weight reduction, and thinning are possible. Because it contains a lot of neodymium and iron, it is easy to rust. Surface chemical passivation is currently one of the good solutions.