Kinds of magnet for motor

Neodymium Iron Boron magnets were commercially introduced in the early 1980s.They are widely use today in many different applications.The cost of this magnet material(on a dollars per energy product basis) is comparable to that of Ferrite magnets.On a dollars per pound basis,the cost of NEO magnets is about 10-20 times that of Ferrite magnets. Note that NdFeB magnets are covered by various patents(held by Neomax) and only licensed materials are allowed into the USA.There are a number of sources that do sell unlicensed products to those willing to purchase them.