There are three basic methods for casting induction rotor cages. They are centrifugal, high-pressure and low-pressure die-casting [7]. The high-pressure cast is normally limited in application to low voltage motors and smaller HP medium voltage motors. This well-known and widely used process consists in injecting molten aluminum under high pressure through the mold. The molten aluminum must flow through bottom end-ring, rotor slots and must reach the upper end-ring, before solidifying. The normal pressure for this process ranges from 150-300 Kgf/cm2 and the rotor stack is not pre-heated. The aluminum must be injected rapidly so as to not solidify in the rotor bars slot in the lamination stack. As the aluminum is injected from one end of the rotor only, the resulting rotor casting may have metallurgical defects in the end ring at the end opposite of the metal injection. To avoid shrink holes or voids (porosity), as shown in Figure 2, it is necessary to apply some foundries principles. These principles are available in the literature and will not be presented here. The aluminum remains as the most used metal to produce rotor cages. However, important works presenting the use of copper are already available in the literature [10]