What material is used for the motor housing and why?

High-power motors are cast iron, and low-power motors are aluminum alloy casting.

Generally, the electric motor is cast with gray cast iron.

Most or all of the carbon in gray cast iron exists in the form of flake graphite, and the fracture is gray. According to the different forms of graphite, gray cast iron can be divided into three types, gray cast iron, malleable cast iron and ductile iron. These three types are used to make motor housings. Low cost and not easy to deform.