What Kinds of Magnets are Commonly Used in Magnet Motors
Motor magnets are widely used in motors, rotors and so on. With its emergence, many high-tech products have emerged, especially in motor applications, which make many products develop towards miniaturization. The permanent magnet materials commonly used in motors include sintered magnets and bonded magnets. The main types are AlNiCo magnets, ferrite magnets, samarium cobalt, neodymium magnets and so on.
Aluminum-nickel-cobalt: Aluminum-nickel-cobalt permanent magnet is the earliest widely used permanent magnet material, its preparation process and technology are relatively mature. At present, there are factories in Japan, the United States, Europe, Russia, and China.
Ferrite magnet: In the 1950s, ferrite began to flourish, especially in the 1970s, strontium ferrite with good coercivity and magnetic energy machine performance was put into production in large quantities, rapidly expanding the use of ferrite magnet. As a non-metallic magnetic material, ferrite has no disadvantages of metal permanent magnet material, such as easy oxidation, low Curie temperature, and high cost, so it is very popular.
Samarium-Cobalt Material: A permanent magnet material with excellent magnetic properties, which emerged in the mid-1960s, and its performance is very stable. Samarium cobalt is especially suitable for manufacturing motors in terms of magnetic properties, but because of its high price, it is mainly used in the research and development of military motors such as aviation, aerospace, weapons and high-tech motors with high performance.
Neodymium magnets: NdFeB magnetic material is an alloy of Nd, Fe-O, etc., also known as magnet steel. Nd-Fe-B permanent magnets have been widely used in modern industry and electronic technology due to their high magnetic energy product, high energy density and so on, which makes it possible to miniaturize, lightweight and thin the instruments, electro-acoustic motors, magnet rotors, magnetic separation, and magnetization equipment. It is easy to rust because it contains a lot of neodymium and iron. Surface chemical passivation is one of the best solutions at present. The high remanence, high coercivity and high magnetic energy product of sintered NdFeB make it widely used in servo motors, flat brushless motors and stepping motors, IT products, nuclear magnetic resonance, loudspeakers, and other products. Because Nd-Fe-B magnets are easy to rust and oxidize, the surface of Nd-Fe-B magnets is usually electroplated, such as zinc, nickel, silver, gold, etc. It can also be phosphate or sprayed with epoxy resin to slow down the oxidation rate.