THE USE OF POWDER METALS IN DC MOTORS
Motors, like other electromagnetic devices, are benefiting from a rapid development in powder metallurgy. Several grades of ferrous powders are now available in very fine particle sizes. Together with the development in die making and pressing techniques, it has become possible to produce parts whose density is very close to that of wrought iron. The process of making parts form powder metals is essentially compaction followed by sintering. There are many advantages in using powder metals, primarily in providing an economic solution to sourcing parts with complicates shapes. However, it must be understood that parts intended for the magnetic circuit can only operate at lower levels of flux density and permeability than solid steel.
View Full Paper